Which mirror is to be used to obtain a parallel beam of light from a small lamp?

Plane mirror

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Convex mirror

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Concave mirror

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Any one of the above

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Solution

The correct option is C Concave mirror
Concave mirrors are commonly used to get powerful parallel beams of light to focus the light at the longer distances by placing the source of light at the focus of the Concave mirrors.

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A curved mirror converges a parallel beam of light incident on it to its focus, the mirror is

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50 g .

(Use g = 10 {ms}^{- 2})

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