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The Iris diaphragm in the condenser. (the lever sticking out just above the "8" in the image above.
It is called a diaphram.
The amount of light that is directed from the bottom of an optical microscope through a specimen can be increased by using a stronger bulb or light source. A potentiometer can be used to dim or increase the strength of the light source.
The light diaphragm
Regulates the amount of light entering the body tube...
The diaphram Is What Controls How Much Light Is Released.
The iris diaphragm controls the amount of light passing through the slide or specimen, while the substage condenser focuses a cone of light on the slice or specimen.
the diaphragm controls the amount of light entering the microscope
The Iris diaphragm in the condenser. (the lever sticking out just above the "8" in the image above.
It has different sized holes and is used to vary the intensity and size of the cone of light that is projected into the slide
if you are reffering to field of view, its not exactly the amount of specimen, its mainly used to determine how large a specimen is
The diaphragm is a circular disk that adjusts the amount of light entering the stage area.
Field of view
It regulates the amount of light that passes through a specimen.
The adjustable stage opening on a microscope is used to control the amount of light illuminating the specimen.
the twiddley thing.
The condenser and its diaphragm.