Which of the following optical instrument is used for watch repair and testing of precious gems?

Compound microscope

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Refracting telescope

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Simple microscope

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Reflecting telescope

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Solution

The correct option is C Simple microscope
A convex lens with small focal length is used in a simple microscope. It produces a virtual, erect and bigger image of the object which makes it ideal for watch repairing, testing of precious gems etc.

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