Rheostat

... iris is but one of them. Clear blue filters or various other colored filteres, placed in the filter tray below the condenser is another, your rheostat is one , focusing your condenser is another. Then there is Kohler illumination , which my microscope has, plus all the above, in adjusting ...

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... specimen easier to view in the microscope. One is to reduce the amount of light with the iris diaphragm. Name another way. I'll say by using the rheostat (reduce the amount of light with the rheostat?) or by using stains. It will be very helpful if you could help me with these questions. Thank ...

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