Question 1

Which of the following best describes the primary use of lens paper in a biology laboratory?

Accepted Answer

Used for cleaning glass components of equipment, such as microscope lenses.

Question 2

What is the main function of a microscope slide?

Accepted Answer

To hold the specimen for observation under the microscope.

Question 3

Which lens should you use first when trying to locate an area of interest on a specimen?

Accepted Answer

Scanning lens

Question 4

When setting up a new slide and focusing on large details, which objective lens is most appropriate?

Accepted Answer

10x low power lens

Question 5

Which lens is best for focusing on fine detail in a specimen?

Accepted Answer

40x high power lens

Question 6

What is the main advantage of using the 100x oil immersion lens?

Accepted Answer

It refocuses light for enhanced clarity and resolution when viewing specimens.

Question 7

How do you calculate the total magnification when using a microscope?

Accepted Answer

Multiply the magnification of the ocular lens by the objective lens.

Question 8

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

Accepted Answer

$$10 	imes 40 = 400$$

Question 9

Why is immersion oil used with the 100x objective lens?

Accepted Answer

To increase the amount of light entering the lens, improving resolution.

Question 10

A student observes a specimen using the 10x ocular lens and the 10x objective lens. What is the total magnification?

Accepted Answer

$$10 	imes 10 = 100$$

Question 11

Which of the following is NOT a correct use of the scanning lens?

Accepted Answer

Focusing on fine detail.

Question 12

What is the main reason for starting with the lowest power lens when viewing a new slide?

Accepted Answer

It allows you to find and center the specimen more easily.

Question 13

Which step should be performed last when preparing to view a specimen under the microscope at 1000x total magnification?

Accepted Answer

Add immersion oil and switch to the 100x objective lens.

Question 14

A student cleans the microscope lens with a paper towel. What is the most likely outcome?

Accepted Answer

The lens may become scratched or damaged.

Question 15

Which of the following best explains why clarity and resolution are improved with the oil immersion lens?

Accepted Answer

Oil reduces light refraction, allowing more light to enter the lens.

Microscope Components and Their Functions

Study Guide - Practice Questions