Which mirror should 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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None of the above

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Solution

The correct option is D Concave mirror
When the lamp is placed at the focus of the mirror then all the light after reflection becomes parallel to the axis of the mirror as shown in the figure.

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Similar questions

How is a spherical mirror used to diverge a beam of light from a point ? Name the type of mirror used.

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50 g .

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

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