Q: When calculating total magnification, which formula should be used?

$\text{Total magnification} = \text{Ocular lens magnification} \times \text{Objective lens magnification}$

Question 1

Which part of a compound light microscope is responsible for adjusting the amount of light that reaches the specimen?

Accepted Answer

Iris diaphragm lever

Question 2

A student wants to increase the total magnification of a specimen. If the ocular lens is $10	imes$ and the objective lens is $40	imes$, what is the total magnification?

Accepted Answer

$400	imes$

Question 3

Which term describes the distance between the objective lens and the specimen when the specimen is in focus?

Accepted Answer

Working distance

Question 4

If a microscope has a field diameter of $2\ \mathrm{mm}$ at $100	imes$ magnification, what will the field diameter be at $400	imes$ magnification? Use the formula $	ext{Field diameter}_1 	imes 	ext{Magnification}_1 = 	ext{Field diameter}_2 	imes 	ext{Magnification}_2$.

Accepted Answer

$0.5\ \mathrm{mm}$

Question 5

Which of the following best describes the function of the condenser in a compound light microscope?

Accepted Answer

It focuses light onto the specimen.

Question 6

A student observes a buccal cell under high power and notices the nucleus, cell membrane, and cytoplasm. Which staining technique is most likely used to enhance the visibility of these structures?

Accepted Answer

Wet mount with methylene blue

Question 7

Which of the following correctly defines 'resolution' in microscopy?

Accepted Answer

The ability to distinguish two points as separate entities

Question 8

When using the coarse adjustment knob, which objective lens should you avoid to prevent damaging the slide?

Accepted Answer

High power lens

Question 9

A student is preparing a wet mount of cheek cells. Which of the following steps is essential for obtaining a clear image under the microscope?

Accepted Answer

Placing the cover slip at an angle to avoid air bubbles

Question 10

Which of the following best explains the relationship between magnification and field of view?

Accepted Answer

As magnification increases, field of view decreases.

Question 11

If the real image produced by the objective lens is inverted, what is the orientation of the specimen when viewed through the ocular lens?

Accepted Answer

Inverted

Question 12

Which part of the microscope is used to change between different objective lenses?

Accepted Answer

Rotating nosepiece

Question 13

A student calculates the total magnification of a microscope as $1000	imes$. If the ocular lens is $10	imes$, what is the magnification of the objective lens?

Accepted Answer

$100	imes$

Question 14

Which of the following is NOT a function of the mechanical stage?

Accepted Answer

Adjusting the focus of the specimen

Question 15

Which term refers to the thickness of the specimen that is in focus at one time?

Accepted Answer

Depth of field

Question 16

A student is using a $4	imes$ scanning power lens and switches to a $40	imes$ high power lens. What happens to the working distance?

Accepted Answer

It decreases

Question 17

Which of the following best describes 'parfocal' in the context of microscopy?

Accepted Answer

The microscope remains in focus when switching between objective lenses

Question 18

When calculating total magnification, which formula should be used?

Accepted Answer

$	ext{Total magnification} = 	ext{Ocular lens magnification} 	imes 	ext{Objective lens magnification}$

Question 19

Which of the following is the correct sequence for using a compound light microscope to view a specimen?

Accepted Answer

Place slide, select scanning power lens, use coarse adjustment knob, then fine adjustment knob

Question 20

Which of the following is a critical step in preparing a wet mount of buccal cells for microscopic examination?

Accepted Answer

Adding a drop of water to the specimen before placing the cover slip

Microscopy: Key Terms and Learning Objectives

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