A concave mirror is used as a shaving glass. Give reason.

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Solution

Concave mirrors are used as shaving mirrors because of the following reasons:
When the face is placed close to a concave mirror (so that the face is within its focus) the concave mirror produces a magnified and erect image of the face.
Since a large image of the face is seen in the concave mirror, it becomes easier to make a smooth shave.

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