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Question 30

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 $$\theta$$ 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.

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

(A) Ray will come out after one reflection for $$\theta = 30^\circ$$ & $$0 < \ell < L$$.

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(B) For $$\theta = 60^\circ$$ & $$\ell = \frac{L}{2}$$, ray will come out after two reflections.

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(C) For $$\ell = \frac{L}{3}$$ & $$\theta = 60^\circ$$, ray will come out after five reflections.

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(D) For $$\theta = 60^\circ$$ & $$0 < \ell < \frac{L}{2}$$, ray will come out after five reflections.

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