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Question

When viewing through a compound microscope, our eyes should be positioned not on the eyepiece but a short distance away from it for best viewing. Why?

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Solution

When we place our eyes too close to the eyepiece of a compound microscope.We are unable to collect much reflected light .As a result the field of view decreases substantially .Hence the clarity of the image gets blurred,
The best position of the eye for viewing through a compound microscope is at the eye-ring attached to the eyepiece. The precise location of the eye depends on the separation between the object lens and eyepiece.

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