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Two mirrors inclined at angle θ to each other . A ray incident parallel to one of the mirror retrace its path after third reflection , then θ is 1) 45 2) 30 3) 60 4) All of these

Two mirrors inclined at angle θ to each other . A ray incident parallel to one of the mirror retrace its path after third reflection , then θ is


1) 45


2) 30


3) 60


4) All of these

Grade:12

1 Answers

Badiuddin askIITians.ismu Expert
148 Points
12 years ago

Dear mayank

Dear mayank

 

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at third time when ray falls on mirror it should be perpendicular then only it will retrace its path

so   3θ = 90

     θ =30

 

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