Question 1

Which part of the compound light microscope is primarily responsible for concentrating and focusing the light onto the specimen?

Accepted Answer

Condenser

Question 2

A clinical laboratory technician wants to observe unstained urine sediment to identify a waxy cast. Which type of microscope should they use for optimal contrast?

Accepted Answer

Phase-contrast microscope

Question 3

If the ocular lens of a microscope is 10X and the objective lens is 40X, what is the total magnification?

Accepted Answer

$$10 	imes 40 = 400$$

Question 4

Which of the following best describes the function of the numerical aperture (NA) in a microscope?

Accepted Answer

It measures the light-gathering ability and resolution of the objective lens.

Question 5

A laboratory technician is preparing to store a microscope after use. Which of the following is the correct procedure?

Accepted Answer

Put the 4X objective in place, lower the stage to its lowest position, and cover the microscope.

Question 6

Which adjustment knob should be used first when focusing on a specimen with the 10X objective?

Accepted Answer

Coarse adjustment knob

Question 7

A scientist wants to visualize molecules that fluoresce after being labeled with antibodies. Which microscope should they use?

Accepted Answer

Fluorescence microscope

Question 8

What is the correct sequence for the passage of light through a compound microscope?

Accepted Answer

Lamp condenser → Substage lens system → Objective lens → Ocular lens

Question 9

Which type of microscope provides the greatest magnification and resolution, allowing visualization of subcellular structures?

Accepted Answer

Electron microscope

Question 10

Why is it important to never touch microscope lenses with your fingers during cleaning?

Accepted Answer

Oils from fingers can damage the lens coating and reduce image quality.

Question 11

A technician is using a compensated polarized microscope to identify crystals in synovial fluid. What is the main advantage of adding a compensator?

Accepted Answer

It helps differentiate certain crystals and improves visualization for diagnostic purposes.

Question 12

Which of the following statements about digital microscopy is TRUE?

Accepted Answer

It uses artificial neural networks to automatically classify and store images for remote review.

Question 13

A student is viewing a blood smear under oil-immersion. What must be done before switching to a non-oil objective?

Accepted Answer

Remove the oil from the slide before switching objectives.

Question 14

Which part of the microscope is adjusted to control the amount of light passing through the specimen?

Accepted Answer

Aperture iris diaphragm

Question 15

A technician needs to clean the condenser of a microscope. What is the recommended procedure?

Accepted Answer

Polish with lens paper after blowing away dust; use lens cleaner if needed.

Question 16

Which microscope would be most appropriate for viewing objects that appear light against a dark background using scattered light?

Accepted Answer

Darkfield microscope

Question 17

A compound microscope has an ocular lens with a magnification of 10X and an objective lens with a magnification of 100X. What is the total magnification?

Accepted Answer

$$10 	imes 100 = 1000$$

Question 18

Which of the following is NOT a recommended step in cleaning the objectives of a microscope?

Accepted Answer

Take objectives apart to clean the inner surfaces.

Question 19

What is the primary function of the stage on a compound microscope?

Accepted Answer

To support the object being observed, usually with a mechanical stage for movement.

Question 20

Which of the following best explains why higher numerical aperture (NA) values are desirable in microscopy?

Accepted Answer

They enable more highly diffracted image-forming light rays to enter the objective, producing a more highly resolved image.

Chapter 4: The Microscope – Structure, Function, and Types

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