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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 mirrorr 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 mirrorr 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/x`

B

`x/(2y)`

C

`x/y`

D

`y/(2x)`

Text Solution

Verified by Experts

The correct Answer is:
D

`tan 2 theta = y/x`
`2 theta = y/x`
`theta = y/(2x)`
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