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A beam of light from a source L is incid...

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 `L`. When the mirror is rotated through a small angle `theta`, the spot of the light is found to move through a distance `y` on the scale. The angle `theta` is given by `:`

A

`y/(2x)`

B

`y/x`

C

`x/(2y)`

D

`x/y`

Text Solution

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The correct Answer is:
A
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