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Microbiology: Abundance and Diversity of Microbes

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Questions and Answers

What is the primary function of the condenser adjustment and centering screw?

To close or open the iris diaphragm
To adjust the condenser and center it in relation to the objective (correct)
To focus the objective lens
To move the mechanical stage forward and backward

What is the function of the iris diaphragm lever?

To focus the objective lens
To adjust the condenser
To move the mechanical stage left or right
To close or open the diaphragm (correct)

How many sets of lenses are used in a microscope?

Three sets
One set
Two sets (correct)
Four sets

What is the first step in using a microscope?

Mount the specimen on the stage (C) Signup and view all the answers

What should be done to the condenser when using a low power objective lens?

Adjust it to the lowest position (D) Signup and view all the answers

What is the working distance when using a ×10 objective lens?

5.0 – 6.0 mm (B) Signup and view all the answers

How should the iris diaphragm be adjusted when using a high power objective lens?

Half open (A) Signup and view all the answers

What should be done to the objective lens when using a high power objective lens?

Raise it to get a clear image (C) Signup and view all the answers

What is the purpose of the coarse adjustment screw?

To focus the objective lens (D) Signup and view all the answers

What should be done to the illumination light when using a high power objective lens?

Decrease the light intensity (C) Signup and view all the answers

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