All BUT one procedure is appropriate use of a compound light microscope. That is A) beginning all work by closing the diaphragm and re-opening it. B) beginning all work by starting on the low power objective lens. C) turning the eyepiece at the base of the body tube, not at the lens. D) wrapping the cord around the base of the microscope at the completion of work.

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The answer is A because the diaphragm determines the amount of light going through so you don't need to close it in the beginning just switch the light on. You only move it to adjust the amount of light to your liking in order to get a clear image

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