Question

simple microscope is used for watch repair

Answer 1

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.

Answer 2

i) A magnifying glass works on the principle of simple microscope.
ii) When an object is placed within the focal length of a convex lens we get a virtual, erect and magnified image on the same side of the lens.
iii) This principle is used by the watch repairer to see the small parts more clearly. Hence, watchmakers use a magnifying glass while repairing wristwatches .