Question

Which structure controls how much light passes through the specimen

Answer 1

The condenser is the structure that controls how much light passes through the specimen in a microscope.

Step-by-step explanation:

The structure that controls how much light passes through the specimen in a microscope is the condenser. The condenser is a special illuminating system that increases the intensity of light falling on the specimen, making objects easily visible, especially at higher magnifications. It helps to determine the type of condenser that is suitable for an application, depending on how the specimen is examined, whether by transmission, scattering, or reflecting.

Thus, it is the component that regulates the amount of light passing through the specimen. Positioned beneath the stage, it focuses and concentrates light onto the specimen. Adjusting the condenser's aperture and height controls brightness and contrast, influencing the quality of the image. Proper condenser adjustment is essential for optimal visibility and clarity in microscopic observations.

Answer 2

The diaphragm.

Step-by-step explanation:

A diaphragm is a thin non transparent structure with an aperture at its center. Aperture is the opening in a lens through which light passes to enter the camera. Diaphragm controls the passage of light through specimen. It stops the passage of light except for the light passing through aperture. It also limits the brightness of light reaching the focal plane.

The diaphragm is placed close to the lens, where objects are defocused to the maximum in order to pass every ray from the object through the lens. Diaphragm discards some of those rays but allows multiple rays to move through to produce an image. This means that the size of the aperture controls the amount of light that passes through the lens. The center of the aperture coincides with optical axis of the lens. Iris diaphragm is an example. It is used in modern cameras.