Question 1

Which part of the compound microscope, labeled 'a' in the diagram, is responsible for further magnifying the image formed by the objective lens?

Accepted Answer

Ocular lens

Question 2

If the objective lens (labeled 'b') is set to 40X and the ocular lens (labeled 'a') is 10X, what is the total magnification of the specimen?

Accepted Answer

$$40 	imes 10 = 400$$

Question 3

What is the primary function of the condenser lenses (labeled 'c') in a compound microscope?

Accepted Answer

To focus light onto the specimen

Question 4

Which component, labeled 'e', provides the initial source of light in the microscope?

Accepted Answer

Illuminator

Question 5

What is the role of the diaphragm (labeled 'd') in the compound microscope?

Accepted Answer

It adjusts the intensity and size of the light beam

Question 6

In the path of light through a compound microscope, which sequence is correct?

Accepted Answer

Illuminator → Diaphragm → Condenser lenses → Objective lens → Ocular lens

Question 7

If the condenser lenses (labeled 'c') are not properly aligned, what is the most likely effect on the image?

Accepted Answer

The image will be dim and poorly resolved

Question 8

Which part of the microscope should be adjusted to control the amount of light reaching the specimen without changing the focus?

Accepted Answer

Diaphragm

Question 9

Why is immersion oil used with the highest power objective lens (typically 100X)?

Accepted Answer

To prevent refraction of light and improve resolution

Question 10

Which lens system, labeled in the diagram, is primarily responsible for forming the initial magnified image of the specimen?

Accepted Answer

Objective lens (b)

Observing Microorganisms Through a Microscope: Principles and Techniques

Study Guide - Practice Questions