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Question

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

A
28
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B
30
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C
32
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D
34
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Solution

The correct option is B 30
no. of reflection =23x
as x= length occupied by ray in 1 reflection & we have 23 as total length.
tan30=x0.2
13=x0.20.23=x
0. total no. of reflection =23x=230.23=30
Hence option 'B) is correct


2001994_1285715_ans_6be015c8e65044ff94f86a5108fa6108.PNG

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