Microscope rheostat is a part of microscope that is present at the side of microscope in order to adjusting light intensity.
If more light is needed to view the specimen, w have to adjust light intensity with microscope rheostat that controls the light intensity. The light intensity is adjusted by rotating the microscope rheostat until the specimen can be clearly seen in the microscope. The microscope rheostat is present at the side of the compound microscope. To increase the light intensity, the knob is turned clockwise whereas the light intensity decreases if we rotate it counter-clockwise so we can say that microscope rheostat is responsible for adjusting light intensity.
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