Question

fill in the blank in the sentence below with the part of the microscope that completes that function. the choose your answer... is the lever that is used to adjust the amount of light that enters the specimen.

Explanation:

The part of the microscope that adjusts the amount of light entering the specimen is the diaphragm (specifically the iris diaphragm). It controls the size of the light beam, thus regulating light intensity.

Answer:

diaphragm (or iris diaphragm)