NEET | 2017Geometrical OpticsHard

Question

A beam of light from a source L is incident normally on a plane mirror fixed at a certain distance x from the source. The beam is reflected back as a spot on a scale placed just above the source I. When the mirror is rotated through a small angle θ, the spot of the light is found to move through a distance y on the scale. The angle q is given by :-

Options

A.

y/x

B.

x/2y

C.

x/y

D.

y/2x

Solution


2θ=yx    ;   θ=y2x

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