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Two mirrors are inclined at an angle $$\theta$$ as shown in the figure. Light ray is incident parallel to one of the mirrors. The way will start retracting its path after third reflection if:

A
$${\theta}={45}^{o}$$
B
$$\theta={30}^{o}$$
C
$$\theta={60}^{o}$$
D
all three
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Solution
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Correct option is A. $${\theta}={45}^{o}$$

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