What is the function of the iris diaphragm?

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Multiple Choice

What is the function of the iris diaphragm?

Explanation:
The iris diaphragm’s job is to regulate how much light reaches the slide. It does this with adjustable blades that open or close a central aperture in the illumination path, changing the brightness and contrast of the image. By adjusting the opening, you can optimize illumination for better contrast and resolution at different magnifications, and it works with the condenser to produce even lighting across the specimen. It does not shade the eyepiece, and it does not change magnification or focus—those are controlled by other parts of the microscope.

The iris diaphragm’s job is to regulate how much light reaches the slide. It does this with adjustable blades that open or close a central aperture in the illumination path, changing the brightness and contrast of the image. By adjusting the opening, you can optimize illumination for better contrast and resolution at different magnifications, and it works with the condenser to produce even lighting across the specimen. It does not shade the eyepiece, and it does not change magnification or focus—those are controlled by other parts of the microscope.

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