Question

A ray either incident from the focus (or converging at the focus), after reflection from a spherical mirror :
(a) becomes perpendicular to the principal axis
(b) becomes parallel to the principal axis
(c) becomes normal to the focus
(d) passes through the centre of curvature

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Answer

(b) becomes parallel to the principal axis

Reason — A ray either incident from the focus (or converging at the focus), after reflection from a spherical mirror becomes parallel to the principal axis.

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