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Question
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 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-
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 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-
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Solution
The correct option is B 30
From the ray diagram,
d=0.2tan30∘=0.2√3
Where, d=Distance covered by the ray in one reflection
Then, no. of reflection it undergoes before emerging out,
⇒N=ld=2√3(0.2√3)=30
<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}-->
Hence, (B) is the correct answer.
From the ray diagram,
d=0.2tan30∘=0.2√3
Where, d=Distance covered by the ray in one reflection
Then, no. of reflection it undergoes before emerging out,
⇒N=ld=2√3(0.2√3)=30
<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Hence, (B) is the correct answer.
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