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20 Physics -- Reflection at Plane Surfaces

a ray reflected successively from two plane mirrors inclined at a certain angle undergoes a deviation of 300. Then the angle isa) 30    b) 60    c) 90    d 120

a ray reflected successively from two plane mirrors inclined at a certain angle undergoes a deviation of 300. Then the angle is

a) 30    b) 60    c) 90    d 120

1 Answers

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      , ∠ABD=y 

Here AD and BD are Normal lines,

      
              
Total deviation is  
                             
                             


Here from the question deviation angle is 300o

let, a be the angle between two plane mirror,

     therefore, 

                300o = 360o - 2a

             so, a= 30o

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