The structure that controls how much light passes through a specimen in a microscope is called the diaphragm or iris diaphragm. This component is typically located beneath the stage and above the light source. By adjusting the diaphragm, the user can change the diameter of the opening, thereby regulating the amount of light that reaches the specimen and enhancing the clarity and contrast of the image being viewed.
which structure controls how much light passes thru the specimen
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