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Q.

A ray of light is incident at 50o on the middle of one of the two mirrors arranged at an angle of 60o  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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a

80o

b

70o

c

50o

d

60o

answer is C.

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Detailed Solution

Question Image

From triangle 

Question Image

20∘+140∘+x=180∘x=20∘ Angel of incident i=90−20i=70∘

From the above fig angle of incidence is 70o

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