Give reasons:
A simple microscope is used by watch repairers.

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Solution

A simple microscope is used by watch repairers because,a magnification of about 20 times is obtained by the convex lens of small focal length used in a simple microscope.Therefore, it is used by watch repairers to see the minute parts of the watch clearly without causing any strain to the eyes.

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(2) A simple microscope is used by watch repairers.

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