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Mayank Bhardwaj Grade: 12
        

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

7 years ago

Answers : (1)

Badiuddin askIITians.ismu Expert
147 Points
										

Dear mayank


Dear mayank


 


7862-207_7662_untitled.JPG


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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Badiuddin


7 years ago
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