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JEE Advanced 2022 Paper 1

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Question : 30

Total: 54

Three plane mirrors form an equilateral triangle with each side of length L. There is a small hole at a distance l>0 from one of the corners as shown in the figure. A ray of light is passed through the hole at an angle θ and can only come out through the same hole. The cross section of the mirror configuration and the ray of light lie on the same plane.

Which of the following statement(s) is(are) correct?

[JEE Adv 2022 P1]

The ray of light will come out for θ=30∘, for 0<l<L.
There is an angle for l=‌
L
2
at which the ray of light will come out after two reflections.
The ray of light will NEVER come out for θ=60∘, and l=‌
L
3
.
The ray of light will come out for θ=60∘, and 0<l<‌
L
2
after six reflections.

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