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(B) When a point source of light is placed at the principal focus $(F)$ of a concave mirror,the light rays originating from the source strike the mirr

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Concave mirror

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(B) When a point source of light is placed at the principal focus $(F)$ of a concave mirror,the light rays originating from the source strike the mirror and are reflected parallel to the principal axis.This is because,according to the laws of reflection,any ray passing through the focus of a concave mirror becomes parallel to the principal axis after reflection.Therefore,a concave mirror can produce a parallel beam of light from a point source.

Given a point source of light,which of the following can produce a parallel beam of light?

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