Question 1

Which of the following is the correct way to carry the Leica CME microscope from the cabinet to your workstation?

Accepted Answer

Hold the microscope by the arm with one hand and support the base with the other hand.

Question 2

After turning on the Leica CME microscope, what is the recommended initial setting for the light intensity?

Accepted Answer

Set the light intensity to half power.

Question 3

Why is it important to raise the condenser to its highest position before beginning to use the microscope?

Accepted Answer

To maximize the amount of light passing through the specimen for optimal illumination.

Question 4

When adjusting the interpupillary distance (IPD) on the Leica CME microscope, what is the correct procedure?

Accepted Answer

Move the eye tubes together or apart until you see one field of view, then align your IPD number with the line on the eye tube.

Question 5

A student places a slide under the clip instead of holding it by the edges with the clip. What is the most likely consequence?

Accepted Answer

The slide may break or become misaligned, making observation difficult.

Question 6

If you focus your specimen using the 10x objective and then switch to the 40x objective, what should you do to achieve the best focus?

Accepted Answer

Use only the fine focus knob with your right eye.

Question 7

After focusing with your right eye on the Leica CME microscope, your left eye sees a blurry image. What is the correct adjustment to make?

Accepted Answer

Adjust the diopter on the left eye tube.

Question 8

Which of the following is the correct sequence for shutting down and storing the Leica CME microscope after use?

Accepted Answer

Switch to the 4x objective, lower the light intensity, turn off the microscope, unplug it, wrap the cord, and return it to its numbered shelf.

Question 9

If, after switching from the 40x objective to the 10x objective, your specimen is no longer in focus, what is the most likely reason?

Accepted Answer

The microscope was not properly parfocal, or the slide was moved during the switch.

Question 10

A student forgets to close the aperture diaphragm of the condenser before starting observations. What effect is this most likely to have on the image?

Accepted Answer

The image will have reduced contrast, making details harder to see.

Question 11

Which of the following best explains why you should always start focusing with the lowest power objective (e.g., 4x or 10x) before moving to higher powers?

Accepted Answer

It provides a wider field of view and reduces the risk of damaging the slide or objective lens.

Question 12

If the field of view appears as two overlapping circles when looking through the microscope, what adjustment should you make?

Accepted Answer

Adjust the interpupillary distance (IPD) until you see one circle.

Question 13

A student leaves the microscope light intensity at maximum after use. What is a potential consequence of this action?

Accepted Answer

The bulb may burn out more quickly, reducing the lifespan of the microscope.

Question 14

Which part of the Leica CME microscope is responsible for controlling the amount of light that reaches the specimen?

Accepted Answer

The aperture diaphragm of the condenser.

Question 15

If a student does not wrap the cord properly when storing the microscope, what is a possible outcome?

Accepted Answer

The cord may become damaged or tangled, creating a safety hazard.

Question 16

Which formula best represents the total magnification when using the 10x eyepiece and the 40x objective lens?

Accepted Answer

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

Question 17

A student is unable to see the specimen clearly at any magnification. Which of the following is the LEAST likely cause?

Accepted Answer

The microscope cord was not wrapped properly after previous use.

Question 18

If the measurement lines for interpupillary distance (IPD) are 2 mm apart, and your IPD is set at 66 mm, how many lines from the minimum setting (54 mm) should you count?

Accepted Answer

$$\frac{66\,	ext{mm} - 54\,	ext{mm}}{2\,	ext{mm}} = 6$$

Question 19

Which of the following best describes the function of the fine focus knob on the Leica CME microscope?

Accepted Answer

It allows for precise focusing adjustments, especially at higher magnifications.

Question 20

A student switches from the 10x to the 40x objective and notices the image is very dark. What is the best adjustment to make?

Accepted Answer

Open the aperture diaphragm to allow more light through the condenser.

Using the Leica CME Microscope: Operation and Care

Study Guide - Practice Questions

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