Microscope Worksheet

This microscope is the most commonly used. ) Fine Adjustment Knob C. Learn microscope with free interactive flashcards. Their small sizes fit smaller hands and faces. Microscopes: Introduction : In biology, there are lots of things that are interesting but too tiny to see well - sometimes to see at all - with the naked eye. CSI Forensics Student Lab Worksheet To develop an understanding of electrophoresis principles. We have included two activities. Rocks and Minerals The ground we walk on, build on, and grow gardens on is made of rock. They are located inside the nucleus of animal and plant cells and can ONLY be seen under the microscope when the cells. Using the microscope takes lots of practice. Through the virtual lab, students will work in the virtual lab of a dairy processing plant to analyze yogurt samples and test for Salmonella and E. FREE Printable Microscope Diagram Worksheet - great for learning the parts of a microscope or use as a quiz WEEK 2 Write the letter on the line that represents each part of the microscope. The BZ-X Fluorescence Microscope supports brightfield, phase contrast, oblique illumination, and fluorescence observation all within a single unit and without the need for a darkroom. You would use a microscope to look at something tiny, like an amoeba. The condenser lens is just below the stage. The Microscope ­ Parts and Use Name:_____ Period:_____ Historians credit the invention of the compound microscope to the Dutch spectacle maker, Zacharias Janssen, around the year 1590. Explain that the can is made from a metal called aluminum and demonstrate what aluminum looks like in its natural state with the Elements 4D blocks and Elements 4D app. NY Microscope Co. PURPOSE AND SCOPE To describe the general protocol for the use, care and maintenance of microscopes in laboratories in which. Microscope World has PDF printable versions of both microscope activities shown below that you can print and use for free here. About This Quiz & Worksheet. The compound light microscope is an instrument containing two lenses, which magnify, and a variety of knobs to resolve (focus) the image. BIOLOGY: Worksheets. Because of its coastline and harbors, Washington is important to trade with the state of Alaska, Canada, and other countries in the Pacific Rim, and it has developed an economy. This activity has been designed for use in homes and schools. Make accurate drawings of what is seen under a microscope. However, before you get a water sample, you should observe the water in the. For the lenses, I went to a local photography shop and they were very kind to give me an entire. Introduction to the Microscope Lab Activity Introduction "Micro" refers to tiny, "scope" refers to view or look at. Have you just gotten introduced to the telescope and have an assignment on naming all the parts? Take the test below and see just how much you understood in class while understanding it a little bit more. Cell Theory Worksheet Name _____ 1. Each student should have their own worksheet(s). If you do not know how to use a microscope properly, you will have a difficult time finding specimens/cells in this unit. Compound microscopes 5 parts of the microscope quiz biological cell microscopes. Explain that the can is made from a metal called aluminum and demonstrate what aluminum looks like in its natural state with the Elements 4D blocks and Elements 4D app. Take a look at the microscopic world of bone in our virtual bone histology lab. with more related ideas as follows blank water cycle worksheet, microscope parts and use and microscope parts worksheet answers. com Answers Name: 1 Answer Key Science 1-7 86 71 57 43 29 14 0 1. Our printable Microscope Observation worksheets will help you keep track of the things. A microscope's field of view (FOV) helps determine the approximate size of objects too small to measure with a ruler. Electron microscopes form images from beams of electrons. Labeling the Parts of the Microscopes including Free Printouts from Parts Of A Microscope Worksheet, source:microscopeworld. Powered by Create your own unique website with. Lab 3: Microscope and Cells (revised fall 2009) Lab 3 - Biol 211 - Page 1 of 26 Lab 3. You need to turn the knob only slightly to focus because the microscope is. Learn more in this informative article for children. (2010, September 2) Inside A Cell. Using the microscope takes lots of practice. Can you pick the correct part of the microscope when given the part's name? Test your knowledge on this science quiz to see how you do and compare your score to others. 46 images for Microscope Drawing Worksheet. Have all materials set out. The Nature of Science What is Science?- Notes ; The Nature of Science- Powerpoint. You can produce a style without a box mix, or you’re able to clone it from a current record. The backbone of any improvement of governance, its development as well as its protection from any form of wastage or excessiveness, is a mechanism to place laws under the microscope of revision and modernization until they resonate in tune with the methodological development and new administrative technologies. A very large central empty area (vacuole)? 4. In this activity, students identify and label the main parts of a microscope and describe their function. High-quality images and animations can be generated. Microscope Calculations: Field of View, Object Size, Drawing Magnification When looking into a microscope, you will see a lit circular area. This worksheet asks pupils to label the different parts of a microscope and then match up the keyterms with their function. The arm connects the microscope's base to the head. Page 1 of 1. Use a microscope properly. Microscope Worksheet. Microscopes have been around for centuries, but they continue to be updated, allowing. Main Gas valve E. but they are mixed-up. As much as I like them to write observations and draw illustrations of the organisms they encounter, students are often too enthusiastic about the things they. parts a microscope worksheet answers resumeee parts a microscope worksheet answers - encouraged in order to my blog site in this particular time i am going to provide you with concerning parts of a microscope worksheet answers microscope labeling key the biology corner that shows the parts of the microscope from a photo can be used to grade. Microscope Parts. Do you believe you understood how to use it? Take up the test and see if you need a refresher?. These coloring pages and worksheets feature different areas of biology as well as fun facts. The compound microscope has two systems of lenses for greater magnification, 1) the ocular, or eyepiece lens that one looks into and 2) the objective lens, or the lens closest to the object. 4 Microscopy Microscopes enable biologists to study biological specimens and organisms in more detail. List the primary parts (7) of a microscope. If you and your group members are not familiar with the procedure before coming to lab, you may have difficulty completing this exercise during the lab period. Why would Hooke’s work have been impossible without a microscope? Cell Theory Timeline and Worksheet. Quiz worksheet parts and uses of the compound microscope print introduction to worksheet. Relate the following structures of living organisms to their functions: Animals: respiration - gills, lungs; digestion - stomach, intestines; circulation - heart, ve. The first lens is called the objective and the second lens is the eyepiece. Looked at cork and called it "cells" B. Iris Sorotsky 308668896 3 Compound Microscope In general, a compound microscope is made of multiple lenses to collect light from the sample and then a separate set of lenses to focus the light into the eye or camera. For instance, start with the concepts of image formation, numerical aperture and the Köhler illumination. Tuesday:double (microscope lab) Parts 1 and 2 (how to make a wet mount slide of letter "e") HWK: Write up Cover page to microscope lab. There may be a review of the metric system. Relatively thick borders (cell walls)? 5. In this lesson, you'll learn about the history and key parts of an essential scientific tool: the microscope. Finally, here we have a microscope worksheet. How Can a Microscope Help Us Study Living Things? Microscope: an instrument that makes things look bigger Biology: the study of living things. Some of the worksheets displayed are The microscope parts and use, Parts of the light microscope, Grade7lifescience lessonunitplanname microscopelab, Microscope parts and their functions, Parts of a microscope, Microscope mania, Work the student microscope, Lab 3 use of the microscope. Electron Microscope Worksheet Go to Mrs. Calculating Magnification Magnification is the number of times larger an image is compared with the real size of the object. Tell students that the smallest piece of aluminum is an atom, and ask them to. Science Worksheets. Note: This is an OBSERVATION lab, so you do not need to have a hypothesis. ESL Printables, the website where English Language teachers exchange resources: worksheets, lesson plans, activities, etc. Objective lens: The lens of a microscope that is nearest the object being viewed. Learn about the components of scanning electron microscopes. The invention of the microscope in the late 1500s revealed to early scientists a whole new world of tiny cells. The lenses bend or refract light to make the object beneath them appear closer. Worksheet 2 was designed by one of our users. Put a copy in your notes section of your folder when you are done labeling the parts. If the microscopes being used are not powerful enough to magnify detail needed for. 1 Name the two main types of microscope used to study biological specimens in detail. Microscope labeled diagram. size of images and size of objects on the extension task from the worksheet. And, of course, there are some microbes which cannot be seen even with a microscope, unless it is an electron microscope, such as the viruses. The Cell: Microscopes. The entire microscope is handled by a strong and curved structure known as the arm. Hooke described it as consisting of “a great many little boxes. Microscope Parts And. The light dimmer controls the microscope's illumination levels. pdf FREE PDF DOWNLOAD. We have a dream about these Microscope Labeling Worksheet pictures gallery can be a resource for you, bring you more references and most important: bring you what you want. However, it has a low resolution. than life size. FREE Printable Microscope Diagram Worksheet - great for learning the parts of a microscope or use as a quiz More information Find this Pin and more on Microbiology by Ashley Thao. ! Arm Ocular Lens Power Switch. It is also used to carry the microscope. Microscopes are tools used to enlarge small objects so as they can be studied. Microscope Parts And - Displaying top 8 worksheets found for this concept. I used a cheap LED wall light from Wal-Mart. This microscope is the most commonly used. Compound light microscope worksheet hypeelite using the microscope. sometimes called the compound microscope in addition to being referred to as being a light microscope. Common magnifications: 40x, 100x, 400x Stereoscope - this microscope allows for binocular (two eyes) viewing of larger. How Can a Microscope Help Us Study Living Things? Microscope: an instrument that makes things look bigger Biology: the study of living things. Once you view a dollar bill under a microscope, you see how detailed money really is. We specialize in high-quality microscopes, digital microscopes and digital cameras offered at competitive prices. The Microscope ­ Parts and Use Name:_____ Period:_____ Historians credit the invention of the compound microscope to the Dutch spectacle maker, Zacharias Janssen, around the year 1590. Worked Example. Learn microscope with free interactive flashcards. Keeping the microscope optics clean is important for high-quality imaging. The microscope. lab worksheets General Useful Links Microscope parts. Jul 18, 2019 These parts of a microscope printables include word searches, crossword puzzles, and vocabulary worksheets. Choose from 500 different sets of microscope flashcards on Quizlet. We expect you. Microscope Worksheet. The arm is the correct place to grip the microscope when carrying it while supporting the base with the palm of your other hand. A Day in the Life of the Nissequogue River. Each worksheet (as well as the spelling words) also includes a cross-curricular focus on earth science, physical science, history, social sciences, or life sciences. Parts of a Microscope A compound light microscopes use two lenses for greater magnification. Microscopes Worksheets The best worksheets image collection from microscope parts and use worksheet answer key , source:bookmarkurl. microscope prepared slides of onion (allium) root tips Procedure: 1. Two years later, in 1933, Ruska built an electron microscope that exceeded the resolution attainable with an optical (light) microscope. parts a microscope worksheet answers resumeee parts a microscope worksheet answers - encouraged in order to my blog site in this particular time i am going to provide you with concerning parts of a microscope worksheet answers microscope labeling key the biology corner that shows the parts of the microscope from a photo can be used to grade. Microscope Review Worksheet Grade 10 Biology Name _____ Period ___ Date _____ (ONScience text reference: pages 546-547, 543-544) Part A: Label the Microscope Parts with the corresponding number and briefly describe their function. Organic Compound Worksheet 1. Label microscope worksheet davezan davezan. How do you determine TOTAL. This simple experiment will show you the interesting world of currency and give you an inkling into how much goes into anti-counterfeiting measures. Even you can use microscopes in your science lab to make things look bigger than they really are. DO NOT copy any definition or part of a definition. Obtain a prepared slide of an onion root tip (there will be three root tips on a. Displaying top 8 worksheets found for - Parts And Functions Of A Microscope. for courses such as high school biology, but students of all ages can benefit from access to a microscope. Cell - Microscope PPT. 2 Using a microscope 1 Place the microscope where plenty of light falls onto the mirror. What two scientists are credited with “inventing” the microscope? 3. His work was a giant _________ turtle gorilla step tower for science. Microscopes are tools used to enlarge images of small objects so as they can be studied. So you have a microscope (or are giving one to the kids for Christmas) and you’re stuck on what to do next? Here are 50 easy-to-find things to view under a microscope. Scientific Instruments and Measurement Worksheet Use a ruler to answer the following questions. We have science worksheets for many topics, including animal classifications, food chains, electricity, magnetism, human body, and simple machines. Microscope Parts. Basic parts of the microscope:. Genetic Science Learning Center. All the rocks in the world are made up of chemicals called minerals. Microscopes are scientific instruments that allow you to observe very small objects and make them look bigger so you can see more detail that could ever be seen without help. The lamp is also called the base lens and sits on the base. Electron Microscope- Principle, Types, Components, Applications, Advantages, Limitations. Microscope Parts And - Displaying top 8 worksheets found for this concept. Compound microscopes 5 parts of the microscope quiz biological cell microscopes. Draw a picture of the 3 year old stem (hint - it is plant tissue). with more related ideas as follows microscope parts quiz worksheet, microscope parts blank diagram and compound light microscope parts worksheet. Crime Scene Investigation Log worksheet. Part 1 Procedure: Letter “e” 1. The extremely minute size of this wonderful structure remained an obstacle for cytologists until the invention of microscope. It is important to lift them from the cabinet with the use of two hands. [2] Magnification and resolution are two factors that determine how much detail can be seen through a microscope. Kids microscopes provide an unbeatable introduction to science and microorganisms. Parts Of The Microscope Worksheet Answers. How Can a Microscope Help Us Study Living Things? Microscope: an instrument that makes things look bigger Biology: the study of living things. In this article we have 20 great images on Microscope Parts And Use Worksheet Answer Key. Many of these are one celled organisms called PROTOZOA [pro tuh ZO uh] and BACTERIA. Showing top 8 worksheets in the category - Parts Of Microscope. Prezi design tips to make your background image work for you. 150 cm-focal length microscope objective is 0. The letter "e" is something everyone should be familiar with (or at least I hope so). view or look. Worksheets and Handouts. Find Parts Of A Microscope Worksheet related suppliers, manufacturers, products and specifications on GlobalSpec - a trusted source of Parts Of A Microscope Worksheet information. This website and its content is subject to our Terms and Conditions. This can happen during: and. However, it has a low resolution. • Professor of Immunopharmacology • Director, Purdue University Cytometry Laboratories. The following free printables can help you teach your students the basic parts of a microscope so that they are ready to dive into a world previously unseen. a device that uses lenses to make very small objects look larger, so that they can be…. DO NOT copy any definition or part of a definition. Nosepiece Holds two or more objective lenses and can be rotated to change power. Most microscopes used in a classroom setting are compound microscopes. This microscope is the most commonly used. English Flashcards. We hope this graphic will be one of excellent reference for Microscope Parts And Use Worksheet Answer Key Along With Labeling The Parts Of The Microscope Blank Diagram Available For. FREE Printable Microscope Diagram Worksheet - great for learning the parts of a microscope or use as a quiz More information Find this Pin and more on Microbiology by Ashley Thao. Credit is given for this original activity to Mr. First, we purchased digital stereo microscopes and related supplies for Hawaii Department of Education (HDOE) middle schools statewide. We service and repair all brands of microscopes, on the field or at our in-house service center. You should see hundreds of tiny red blood cells; there are billions circulating throughout our blood stream. Convex Lenses are curved glass used to make microscopes (and glasses etc. To the right is a cell’s Mitochondria as seen under an electron microscope. 1: Darwin's Voyage of Discovery book scan Modified 17. Determined that all animals were made of cells A. Science 10 Microscope Worksheet: Calculating Magnification. Purpose: The student will correctly identify and draw four stages of mitosis using microscope slide images of onion root tips and whitefish blastulae. What is a compound? A compound is any chemical that is made of two or more different elements. Chromosomes are thread-like structures made up of. Make copies of Blood Cell Model Worksheet and Blood Cells Under a Microscope Worksheet (for optional section). Once you view a dollar bill under a microscope, you see how detailed money really is. Used for final focusing Eyepiece Platform upon which to mount the slide Worksheet - Mic - Crossword Puzzle - Answers. Hass McCook. Digital Microscopes: Digital microscopes allow for live image transmission to a TV or computer screen and have helped revolutionize microphotography. pdf FREE PDF DOWNLOAD. Give your students an insight into the amazing world of biology with this easy lesson plan and fun activities. Organic Compounds Student Worksheet. For the lenses, I went to a local photography shop and they were very kind to give me an entire. This microscope website is educational and intended to educate, inform and provide resources. 1 – 6) and the procedures (pp. Feel free to explore, study and enjoy paintings with PaintingValley. Microscopes Worksheets The best worksheets image collection from microscope parts and use worksheet answer key , source:bookmarkurl. Microscope worksheet! Important reminders when using a microscope. Kids microscopes provide an unbeatable introduction to science and microorganisms. I used a cheap LED wall light from Wal-Mart. TELESCOPES AND MICROSCOPES 3 Refracting Telescopes A common type of visual telescope uses two converging lenses: one to form a real image of the distant object and the second to magnify that real image so that you can see its fine detail (Fig. Scientists use microscopes to observe things that are too small to be seen with the naked eye. Some living things are so small we can’t see them with the naked eye alone. New York Microscope Company Inc. 2 Diagram for Labeling: Microscope using the p. Microscopy of fabric samples • Show students how to make microscope slides by putting fabric fibres onto a small drop of water underneath a cover slip. To know more about a compound microscope, its basics, and uses in various fields, read on. The entire microscope is handled by a strong and curved structure known as the arm. Onion Mitosis Root Tip Microscope Slides. Telephone F. To view your own human cheek cells under the microscope. The lenses bend or refract light to make the object beneath them appear closer. Looked at cork and called it "cells" B. There are several different types of microscopes used in light microscopy, and the four most popular types are Compound, Stereo, Digital and the Pocket or handheld microscopes. This Teachers Printable belongs to these categories: worksheet. Some of the worksheets for this concept are Parts of the light microscope, The microscope parts and use, Microscope mania, Parts of a microscope s, Parts of the microscope study, Parts of the microscope matching activity, Use the word list to help you label the 12, Grade7lifescience lessonunitplanname microscopelab. Before the microscope was invented, people thought there was nothing smaller than the smallest things that could be viewed with the human eye. This allows students to build their reading comprehension skills and reinforce knowledge in. What is the difference between animal and plant cell? Print these free worksheets. A study sheet to learn the parts of the microscope. Tell students that the smallest piece of aluminum is an atom, and ask them to. 1) Had Anton von Leeuwenhoek never invented the microscope, our society would be quite different. Microscope Parts And Function. English Flashcards. The following free printables can help you teach your students the basic parts of a microscope so that they are ready to dive into a world previously unseen. Atoms are made up of three basic parts; protons,. But are you familiar with its different parts and their names? This fun worksheet tests your knowledge about this scientific instrument. 4 Microscopy Microscopes enable biologists to study biological specimens and organisms in more detail. Color the Parts of the Microscope. [2] Magnification and resolution are two factors that determine how much detail can be seen through a microscope. Proper use of a microscope is paramount to ensure good results and to maintain its condition. Take the Quiz: Microscope Parts and Lenses. Page 1 of 1. ANSWERS 1 – eye piece 2 – arm or body 3 – revolving nose piece 4 – lens or objective 5 – clip 6 – stage 7 – coarse. By the end of this activity, students should be able to: identify the main parts of a microscope; describe the function of the different parts of a microscope. His work was a giant _________ turtle gorilla step tower for science. Each worksheet (as well as the spelling words) also includes a cross-curricular focus on earth science, physical science, history, social sciences, or life sciences. Supported by a Science Education Partnership Award from the National Center for Research Resources, National Institutes of Health, and the David and Lucile Packard Foundation. Microscope Parts. What do the letters DNA stand for?. Microscope Worksheet: How to Record Microscope Observations In the field of science, recording observations while performing an experiment is one of the most useful tools available. Microscope Parts And Function. This is a quiz called Microscope Labeling Game and was created by member sloanescience Login. Showing top 8 worksheets in the category - Cells. All the best Microscope Drawing Worksheet 37+ collected on this page. 22 October 2019. To go to a higher magnification rotate the objective in place. Make a wet mount slide. Cut out the letter "e" from the word "Microscope" above and place it face up on the slide. How do you carry a microscope? _____ _____ What is the Total power of the following objective lenses?. Parts of a. Eye glasses and microscopes work because of refraction. This big microscope puzzle is perfect for science classes learning how to use these important tools. Be cautious when handling glass slides and cover-slips. The earliest microscopes, consisting of two elements, simply produced a larger image of an object under inspection than what the human eye could observe. Name all parts of a microscope. Buckley from Edward Knox High School. for courses such as high school biology, but students of all ages can benefit from access to a microscope. Even though scientists cannot see atoms with microscopes, they have developed ways to detect them and learn about them. Additionally, many microscopes allow the ocular lenses to be adjusted up and down (mechanical tube length adjustment) and there is a scale alongside the tube. The simplest microscope of all is a magnifying glass made from a single convex lens, which typically magnifies by about 5-10 times. These products are durable, easy to store, easy to use, and easy to maintain. Button Text. A website mainly aimed at students studying A-Level Biology - covers genetics, cells, biochemistry, enzymes, ecology, environment, photosynthesis, respiration, heart. A microscope is an instrument for viewing objects that are too small to be seen easily by the naked eye. Do not bump it against anything. 2 Using a microscope 1 Place the microscope where plenty of light falls onto the mirror. In this lesson, you'll learn about the history and key parts of an essential scientific tool: the microscope. Showing top 8 worksheets in the category - Microscope. Using the word bank, label the parts of the microscope. Learn more in this informative article for children. POST: On the worksheet students are to color the stated. Understanding the Compound Microscope Parts and its Functions Compound microscope is a widely used instrument in the field of life sciences helps solve many mysteries of life. In this tab you will find a variety of worksheets about parts of cells as well as engaging, hands-on activities that students will enjoy. Today we will be observing an organism classified as a protist. To left is an onion cell as seen under a light microscope. MicroscopeActivities (be sure to use the back button to return when finished with activity) The Letter "e" Colored Fiber. 4 Microscopy Microscopes enable biologists to study biological specimens and organisms in more detail. Where does this animal live? In this science worksheet, your child learns about the different environments animals. This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 2. You are going to receive answers fast that will save you a great deal of time. Anthony Leeuwenhoek became more involved in science and with his new improved microscope was able to see things that no man had ever seen before. We all know that an "e" is round with a line connecting the upper half. How do you determine TOTAL. Their small sizes fit smaller hands and faces. Electron microscope serves primary two purposes: i) the visual examination of structures too fine to be resolved with ordinary, or light microscopes, and ii) the study of surfaces that emit electrons. Use the Investigation and Experimentation pp R8-R10 in back of your text; pages 23, 24, 70-72 and the Glossary in your. Some of the worksheets for this concept are The microscope parts and use, Parts of the light microscope, Microscope mania, Parts of the microscope quiz, Parts of the microscope matching activity, Parts of the microscope study, Grade7lifescience lessonunitplanname microscopelab. Microscope Study Guide Name: _____ What is the magnification of the eyepiece? _____ What is the total magnification of the following objective lenses with the eyepiece?. Atoms are made up of three basic parts; protons,. Calculate total magnification: Ocular x Objective Ocular Objective Total Magnification 10X 4X 15X 10X 5X 12X 10X 10X 10X 40X 2. Microscope Worksheet. Genetic Science Learning Center. The microscope. microscope parts and use worksheet answers. c) fine adjustment knob. LAB 3 – Use of the Microscope Introduction In this laboratory you will be learning how to use one of the most important tools in biology – the compound light microscope – to view a variety of specimens. Why does a microscope have a small hole in it? To allow light to pass through. NOSEPIECE microscope when carried Holds the HIGH- and LOW- power objective LENSES; can be rotated to change MAGNIFICATION. In this worksheet, students will review their understanding of how to use a microscope, what can go wrong and how to measure specimens. Hill, Beaver Educational Resources 2000. Finally, here we have a microscope worksheet. 2 Worksheet Section 17. Are you looking for the best Microscope Drawing Worksheet for your personal blogs, projects or designs, then ClipArtMag is the place just for you. 1 When you think about life on Earth, you probably think of many living things. How do you calculate the power of magnification?. Microscope Mania Puzzles (pdf) - Two puzzles related to the world of microscopes - a word search and make-a-word challenge. Quiz worksheet parts and uses of the compound microscope print introduction to worksheet. This lesson could be used for grades 3rd-5th. Each worksheet (as well as the spelling words) also includes a cross-curricular focus on earth science, physical science, history, social sciences, or life sciences. "Cell"-ebrate Science Without Worksheets Juanita Pritchard, Consultant Rachel Pritchard, Bulloch County IDEAS June 2014. Label microscope diagram. pdf FREE PDF DOWNLOAD NOW!!! Source #2: microscope parts and use worksheet answers. Stage: The area of the microscope that you place the object being studied. Play this quiz called Microscope Labeling Game and show off your skills. Microscope labeled diagram. Label the microscope diagram. Each cell in your storyboard will be exported as a standalone image in a zip file. "Microscopy and Cells" Lab Worksheet (M/C #2) NAME: Ex. It is a U-shaped structure and supports the entire weight of the compound microscope.