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A ray of light is incident at 50^o on the middle of one of the two mirrors arranged at an angle of 60^o between them. The ray then touches the second mirror, get reflected back to the first mirror, making an angle of incidence of

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80^o

70^o

50^o

60^o

answer is C.

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Detailed Solution

From triangle

$\begin{matrix} 20^{\circ} + 140^{\circ} + x = 180^{\circ} \\ x = 20^{\circ} \\ Angel of incident i = 90 - 20 \\ i = 70^{\circ} \end{matrix}$

From the above fig angle of incidence is 70^o

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