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Question

Two plane mirrors are inclined at 70. A ray incident on one mirror at incidence angle θ , after reflection falls on the second mirror and is reflected from there parallel to the first mirror. The value of θ is

A
50
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B
45
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C
30
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D
25
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Solution

The correct option is A 50
i=r=θ according to snell's law
Applying geometry at A180=2θ+k+x(i)
Now in ABC180=70+K+α180=70+k+70K=40
r=θ=9040 from figure =50
Now putting in (i)
180=2θ+40+40θ=50

2009070_1179890_ans_742ba03c6c744117972ba7a9ca9280d0.PNG

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