Question

which part of the compound microscope is used to adjust the amount of light passing through the specimen?
eyepiece
diaphragm
coarse adjustment knob
objective lens

Explanation:

The diaphragm on a compound microscope controls the amount of light passing through the specimen by adjusting the aperture size. The eyepiece magnifies the image, the coarse - adjustment knob changes the focus, and the objective lens also magnifies the specimen.

Answer:

B. Diaphragm