Q: Which formula correctly calculates the total magnification of a microscope?

$$\text{Total Magnification} = \text{Ocular Magnification} \times \text{Objective Magnification}$$

Q: If the field diameter under scanning power (4x objective) is 10 mm, what is the field diameter under high power (40x objective)? Use the formula $$\text{Field Diameter}_{\text{high}} = \frac{\text{Field Diameter}_{\text{low}} \times \text{Magnification}_{\text{low}}}{\text{Magnification}_{\text{high}}}.$$

$$\frac{10 \times 4}{40} = 1 mm$$

Question 1

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

Accepted Answer

Iris diaphragm

Question 2

If you are using a 10x ocular lens and a 40x objective lens, what is the total magnification of the specimen?

Accepted Answer

$$10 	imes 40 = 400$$

Question 3

When switching from a low power objective to a high power objective, what typically happens to the field of view?

Accepted Answer

It becomes smaller

Question 4

A student observes a specimen under the microscope and moves the slide to the left. In which direction does the image appear to move?

Accepted Answer

To the right

Question 5

Which formula correctly calculates the total magnification of a microscope?

Accepted Answer

$$	ext{Total Magnification} = 	ext{Ocular Magnification} 	imes 	ext{Objective Magnification}$$

Question 6

What is the primary function of the coarse adjustment knob on a compound microscope?

Accepted Answer

To focus the specimen under low power

Question 7

Which term describes the ability of a microscope to distinguish two close objects as separate entities?

Accepted Answer

Resolution

Question 8

If the field diameter under scanning power (4x objective) is 10 mm, what is the field diameter under high power (40x objective)? Use the formula $$	ext{Field Diameter}_{	ext{high}} = \frac{	ext{Field Diameter}_{	ext{low}} 	imes 	ext{Magnification}_{	ext{low}}}{	ext{Magnification}_{	ext{high}}}.$$

Accepted Answer

$$\frac{10 	imes 4}{40} = 1 mm$$

Question 9

Why is it important to start focusing with the scanning objective lens before moving to higher magnifications?

Accepted Answer

It allows you to locate the specimen easily

Question 10

A microscope is described as 'parfocal.' What does this mean?

Accepted Answer

The specimen remains in focus when changing to higher magnification

Question 11

Which of the following best describes 'depth of field' in microscopy?

Accepted Answer

The vertical distance within which the specimen remains in focus

Question 12

When using oil immersion (100x objective), what is the main reason for applying immersion oil between the lens and the slide?

Accepted Answer

To reduce light refraction and improve resolution

Question 13

A student is viewing the letter 'e' under a microscope. If the slide is moved away from the student, in which direction does the image move?

Accepted Answer

Toward the student

Question 14

Which scenario best illustrates the concept of 'resolution' in microscopy?

Accepted Answer

Distinguishing two bacteria that are very close together as separate objects

Question 15

If the working distance decreases as you switch to a higher power objective, what practical implication does this have?

Accepted Answer

You must be careful not to break the slide or damage the objective lens

Question 16

Which of the following is NOT a recommended step when storing a compound microscope?

Accepted Answer

Leave the objective lens in oil immersion position

Question 17

A student calculates the field diameter under low power as 4 mm and the magnification as 10x. What is the field diameter under high power (40x)? Use $$	ext{Field Diameter}_{	ext{high}} = \frac{4 	imes 10}{40}.$$

Accepted Answer

1 mm

Question 18

Which part of the microscope should you use to make fine adjustments to the focus, especially under high power?

Accepted Answer

Fine adjustment knob

Question 19

Why is it generally better to decrease the light intensity when switching to a higher power objective?

Accepted Answer

To improve contrast and see more details

Question 20

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

Accepted Answer

Light passes through the specimen, then the objective lens, then the ocular lens

Microscopy: Structure, Function, and Use in Anatomy & Physiology

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