Question

why watch repairer uses simple microscope for watch repairing​

Answer 1

Answer:

A watch has tiny parts which cannot be seen by our naked eyes. Thus, a simple microscope is used to repair the watches. A simple microscope has magnification of about 20 times obtained by the convex lens of small focal length, which is helpful in making the repairer see the parts easily.

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Answer 2

Some parts of the watch is so tiny that it can't be seen through naked eyes so simple microscope is used..