Question

which of the following best describes the function of the field diaphragm on a compound microscope: select one: a. the field diaphragm is an adjustable opening used to focus light from the lamp onto the specimen. b. the field diaphragm is the region where the specimen is placed for viewing. c. the field diaphragm is an adjustable opening used to limit the amount of stray light entering the objective. d. the field diaphragm permits researchers to use microscopes in the field.

Explanation:

The field diaphragm on a compound microscope is an adjustable opening. Its main function is to control the amount of stray light that enters the objective lens, which helps in improving the contrast and quality of the observed image. Option a describes the condenser's function for focusing light on the specimen. Option b refers to the stage where the specimen is placed. Option d is an incorrect and made - up function for the field diaphragm.

Answer:

C. The field diaphragm is an adjustable opening used to limit the amount of stray light entering the objective.