This document provides instructions for a lab activity introducing students to the proper use and handling of a compound light microscope. The lab involves learning the parts of the microscope and their functions, preparing wet mount slides, determining total magnification, and practicing focusing at low and high powers. Students will view a prepared slide of the letter "e", draw their observations, and answer conclusion questions about microscope techniques and concepts.
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ANALOGOUS
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Session Overview
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Getting To Know The Microscope Lab
1. Name: __________________________________ Date Completed: _____________________________
Class: ____________ Lab Minutes: _______________ Teacher: _______________________________
Introduction to the Microscope Lab Activity
This lab was created by Mr. Buckley from Edward Knox High School. Credit is given for this original activity to Mr. Buckley.
Introduction
"Micro" refers to tiny, "scope" refers to view or look at. Microscopes are tools used to enlarge images
of small objects so as they can be studied. The compound light microscope is an instrument containing
two lenses, which magnifies, and a variety of knobs to resolve (focus) the picture. Because it uses more
than one lens, it is sometimes called the compound microscope in addition to being referred to as being a
light microscope. In this lab, we will learn about the proper use and handling of the microscope.
Instructional Objectives
• Demonstrate the proper procedures used in correctly using the compound light microscope.
• Prepare and use a wet mount.
• Determine the total magnification of the microscope.
• Explain how to properly handle the microscope.
• Describe changes in the field of view and available light when going from low to high power
using the
compound light microscope
• Explain why objects must be centered in the field of view before going from low to high power
using the compound light microscope.
• Explain how to increase the amount of light when going from low to high power using the
compound light microscope.
• Explain the proper procedure for focusing under low and high power using the compound light
microscope.
Materials
• Compound microscope
• Glass slides
• Cover slips
• Eye dropper
• Beaker of water
• The letter "e" cut from newsprint
• Scissors
2. Procedure
I. Microscope Parts and Function
1. Carry the microscope with both hands --- one on the arm and the other under the base of the
microscope.
2. One person from each group will now go over to the microscope storage area and properly
transport one microscope to your working area.
3. The other person in the group will pick up a pair of scissors, newsprint, a slide, and a cover slip.
4. Remove the dust cover and store it properly. Plug in the scope. Do not turn it on until told to do
so.
5. Examine the microscope and give the function of each of the parts listed on the right side of the
diagram. Use a separate sheet to list and define the function of each part of the microscope.
1. eyepiece or ocular
2. body tube
3. fine adjustment knob
4. nosepiece
5. high power objective
6. low power objective
7. diaphragm
8. mirror (many microscopes have a light instead)
9. base
10. coarse adjustment
11. arm
12. stage clip
13. inclination joint
Part II. Preparing a wet mount of the letter "e”.
1. With your scissors cut out the letter "e" from the newspaper.
2. Place it on the glass slide so as to look like (e).
3. Cover it with a clean cover slip. See the figure below.
3. 4. Using your eyedropper, place a drop of water on the edge of the cover slip where it touches
the glass slide. The water should be sucked under the slide if done properly.
Technique for Adding a Stain when making a Wet Mount
5. Turn on the microscope and place the slide on the stage; making sure the "e" is facing the
normal reading position (see the figure above). Using the course focus and low power, move
the body tube down until the "e" can be seen clearly. Draw what you see in the space below.
6. Describe the relationship between what you see through the eyepiece and what you see on the
stage.
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________
7. Looking through the eyepiece, move the slide to the upper right area of the stage. What direction
does the image move?
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________
8. Now, move it to the lower left side of the stage. What direction does the image move?
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________
4. 9. Re-center the slide and change the scope to high power. You will notice the "e" is out of focus.
DO NOT touch the coarse focus knob, instead use the fine focus to resolve the picture. Draw
the image you see of the letter e (or part of it) on high power.
10. Locate the diaphragm under the stage. Move it and record the changes in light intensity as you do
so.
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________
III. Determining Total Magnification:
1. Locate the numbers on the eyepiece and the low power objective and fill in the blanks below.
Eyepiece magnification Objective magnification Total Magnification
X =
______________ ______________ _____________
2. Do the same for the high power objective.
Eyepiece magnification Objective magnification Total Magnification
X =
______________ ______________ _____________
3. Write out the rule for determining total magnification of a compound microscope:
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________
4. Remove the slide and clean it up. Turn off the microscope and wind up the wire so it resembles
its original position. Place the low power objective in place and lower the body tube. Cover the
scope with the dust cover. Place the scope back in its original space in the cabinet.
5. Conclusion Questions:
1. State TWO procedures that should be used to properly handle a light microscope.
2. Explain why the light microscope is also called the compound microscope.
3. Images observed under the light microscope are reversed and inverted. Explain what this means.
4. Explain why the specimen must be centered in the field of view on low power before going to high
power.
5. A microscope has a 20 X ocular (eyepiece) and two objectives of 10 X and 43 X respectively.
a) Calculate the low power magnification of this microscope. Show your formula and all work.
b) Calculate the high power magnification of this microscope. Show your formula and all work.
6. In three steps using complete sentences, describe how to make a proper wet mount of the letter e.
7. Describe the changes in the field of view and the amount of available light when going from low to
high power using the compound microscope.
8. Explain what the microscope user may have to do to combat the problems incurred in question # 7.
9. How does the procedure for using the microscope differ under high power as opposed to low power?