Question

which glass is used to observe minute parts of watch by watch repairers concave or convex what is its position​

Answer 1

Answer:

The convex lens is used to repair the watch as they need to see the magnified image of the parts of the watch and the convex lens gives you the magnified image in many cases.

If the object is placed at the focus of the convex lens then it will form the highly magnified image at the infinity and that image will be real and inverted.

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Answer 2

Answer:

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.