Which part of a compound light microscope is primarily used to adjust the amount of light that reaches the specimen?

• A. Objective lens
• B. Diaphragm
• C. Stage clip
• D. Coarse focus knob

Answer: (B)

Verified step by step guidance

1. Understand the function of each part of the compound light microscope mentioned in the problem: The objective lens magnifies the image of the specimen, the diaphragm controls the amount of light that reaches the specimen, the stage clip holds the slide in place, and the coarse focus knob adjusts the focus of the image.
2. Identify the part of the microscope that directly interacts with the light source to regulate the intensity or amount of light reaching the specimen.
3. Recall that the diaphragm is specifically designed to adjust the light intensity by opening or closing its aperture, allowing more or less light to pass through.
4. Eliminate the other options based on their functions: The objective lens magnifies, the stage clip secures the slide, and the coarse focus knob adjusts focus, none of which control light intensity.
5. Conclude that the diaphragm is the correct answer because it is the component responsible for adjusting the amount of light that reaches the specimen.