Reflection

2 mirrors are inclined at an angle θ as shown in figure.Light ray is incident parallel to one mirror.The ray will start retracing its path after the third collision if:
a)θ=45° b)θ=30° c)θ=60° d)all three

7 Answers

1
Anirudh Kumar ·

no see the question says that it retraces path afte third collision. somthing like above.

thus θ=30°

Anonymous ·

arka, how do you think it is 45.the reflection should take place after third collision, and in that diagram it retraced after the second collision itself.

1
venkateshan ·

ans : all three...

1
golu pro ·

ans: θ=30°

1
souradeepmajumde majumder ·

ANS IS 45 DEGREE..........

SO 45+B=45+90-B

2B=90
B=45

1
shubhi gupta ·

all three...

1
Arka Halder ·

this question is from arihant,ans given is 30° strangely..
i proceeded like souradeep and surely 45° gives right answer,dunno what they r trying to mean..

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