Q: Which equation best represents the total magnification of a compound microscope?

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

Question 1

Which part of the microscope is responsible for adjusting the amount of light that passes through the specimen, and how does improper adjustment affect image clarity?

Accepted Answer

The iris diaphragm lever; improper adjustment can result in either too dark or too bright images, reducing contrast.

Question 2

A student is using a compound microscope and notices that the image is too dim even though the light control is on. Which part should they adjust to increase brightness without increasing glare?

Accepted Answer

The iris diaphragm lever

Question 3

If a specimen appears blurry under high magnification, which sequence of steps should be followed to achieve a sharp focus?

Accepted Answer

Adjust the coarse adjustment knob, then the fine adjustment knob

Question 4

Which equation best represents the total magnification of a compound microscope?

Accepted Answer

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

Question 5

A microscope has an ocular lens of 10× and a high-power objective lens of 40×. What is the total magnification?

Accepted Answer

$$10 	imes 40 = 400$$

Question 6

Which part of the microscope is used to move the slide precisely in horizontal and vertical directions?

Accepted Answer

Mechanical stage

Question 7

During a lab, a student accidentally rotates the nosepiece and changes the objective lens from 4× to 100×. What effect does this have on the field of view?

Accepted Answer

The field of view decreases as magnification increases.

Question 8

Which part of the microscope provides a sturdy flat surface to support and steady the microscope?

Accepted Answer

Base

Question 9

A student is unable to bring a specimen into focus using the coarse adjustment knob. What is the most likely reason?

Accepted Answer

The fine adjustment knob is needed for precise focusing at high magnification.

Question 10

Which part of the microscope houses the objective lenses and allows for their rotation?

Accepted Answer

Nosepiece

Question 11

If the condenser is not properly adjusted, what is the most likely effect on the specimen image?

Accepted Answer

The image may lack clarity and contrast.

Question 12

Which part of the microscope is specifically designed to hold the slide in position for viewing?

Accepted Answer

Mechanical stage

Question 13

A student is using the scanning lens (4×) and wants to switch to the oil immersion lens (100×). What should they do to avoid damaging the slide?

Accepted Answer

Use the fine adjustment knob and rotate the nosepiece carefully.

Question 14

Which part of the microscope is responsible for carrying the microscope and connecting the base and head?

Accepted Answer

Arm

Question 15

If a student wants to view a specimen at the highest magnification, which sequence of actions is correct?

Accepted Answer

Rotate the nosepiece to the oil immersion lens, adjust the fine adjustment knob, and open the iris diaphragm lever.

Question 16

Which part of the microscope contains the lenses that magnify the specimen and is typically found at the top of the microscope?

Accepted Answer

Ocular lens

Question 17

A student is viewing a specimen and wants to increase the contrast. Which part should they adjust?

Accepted Answer

Iris diaphragm lever

Question 18

Which part of the microscope allows for precise focusing after the initial coarse focus has been completed?

Accepted Answer

Fine adjustment knob

Question 19

A student is using a microscope and notices that the image is not centered. Which part should they adjust to reposition the slide?

Accepted Answer

Mechanical stage

Question 20

Which part of the microscope is located in the base and directs light upward through the specimen?

Accepted Answer

Substage light

The Compound Microscope: Structure and Function (Relevant to Cells: The Living Units)

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