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Question

The concave mirrors are used in:

A
Reflecting telescope
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B
Magic-lanterns
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C
Cinema projectors
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D
All of these
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Solution

The correct option is D All of these
A reflecting telescope uses concave mirrors as they produce images similar to the images produced by convex lenses i.e. upright and smaller than the object.
The magic lantern used a concave mirror in back of a light source to direct as much of the light as possible through a small rectangular sheet of glass.

Concave mirrors project a beam of light outward, which is required in a cinema projector.

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