Which of the following optical instruments is used in repairing watches and testing precious gems?

Reflecting telescope

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Simple microscope

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Compound microscope

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Refracting telescope

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Solution

The correct option is B Simple microscope
A convex lens with a small focal length is used in a simple microscope. It produces a virtual, erect, and a bigger image of the object which makes it ideal to use in repairing watches and testing precious stones.

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