Question

students in a biology lab are using a compound light microscope to view the different types of plant cells present in plant leaves. they learn that there are several microscope structures that must be properly adjusted to produce a good image of the cells. which microscope structure can be adjusted to control the amount of light that shines through a specimen?
a stage
b diaphragm
c ocular lens
d objective lens

Explanation:

To solve this, we analyze each option:

• Option A (stage): The stage holds the specimen, not control light.
• Option B (diaphragm): The diaphragm (or iris diaphragm) in a compound microscope controls the amount of light passing through the specimen.
• Option C (ocular lens): The ocular lens (eyepiece) magnifies the image, not control light.
• Option D (objective lens): Objective lenses magnify the specimen, not control light.

Answer:

B. diaphragm