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Question

A ray reflected successively from two plane mirrors inclined at a certain angle undergoes a deviation of 300. The number of observable images are
(Formula for number of images is 360θ1, where θ is the angle between the mirrors.)


A
15
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B
12
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C
11
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D
13
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Solution

The correct option is D 11
Given:
Angle of deviation, δ=300
We know that, the angle of deviation when the ray is successively reflected by two plane mirrors is given by,
δ=3602θ, where θ is the angle between the mirrors. 
300=3602θ
θ=3603002=30
30 is the angle at which both mirrors are inclined.
So,
n=360θ=36030=12
As n is even, hence, the number of images, 
=n1=121=11

Physics

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