A simple microscope is used by watch repairers.

Ans.

i. A watch has many tiny parts which cannot be seen distinctly without strain to the eyes. 

ii. A magnification of about 20 times is obtained by the convex lens of small focal length used in a simple microscope.

iii. 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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