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Two plane mirrors A and B are aligned pa...

Two plane mirrors A and B are aligned parallel to each other as shown in the figure. A light ray is incident at an angle of `30^(@)` at a point just inside one end of A. The number of times the ray undergoes reflections (including the first one) before it emerges out is

A

`1/(dtantheta)`

B

`d/(Ztantheta)`

C

`Idtantheta`

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
1
Suppose n = Total number of reflection light ray undergoes before exiting out.
x = Horizontal distance travelled by light ray in one reflection.
So nx=l also `tantheta=x/d`
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