Which control adjusts the amount of light reaching the specimen?

Which control adjusts the amount of light reaching the specimen?

• A. Lamp of Microscope
• B. Stage of Microscope
• C. Ocular Lens of Microscope
• D. Iris Diaphragm of Microscope

Answer: (D)

The amount of light reaching the specimen is controlled by adjusting the iris diaphragm, which acts like a camera aperture in the light path. Opening it wider lets more light pass through the condenser to the slide, increasing brightness and contrast; closing it reduces light and sharpens detail by limiting glare. The lamp provides the light source, but it’s the diaphragm that regulate how much of that light actually reaches the specimen. The stage simply moves the slide, and the ocular lens magnifies the image.

The amount of light reaching the specimen is controlled by adjusting the iris diaphragm, which acts like a camera aperture in the light path. Opening it wider lets more light pass through the condenser to the slide, increasing brightness and contrast; closing it reduces light and sharpens detail by limiting glare. The lamp provides the light source, but it’s the diaphragm that regulate how much of that light actually reaches the specimen. The stage simply moves the slide, and the ocular lens magnifies the image.