Four identical mirrors are made to stand vertically to from a square arrangement as shown in a top view. A ray start from the midpoint M of mirror AD and after two reflection reaches corner D. Then angle 
must be:
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
:
The ray starting from point M at an angle 
reaches the corner D at the right along a parallel path. Let a be the length of the side.
From figure,
…(i)
…(ii)
…(iii)
From (i) and (ii), we get
From (ii) and (iii), we get …(iv)
(Using (iv))
Substituting this value of x in equatin (i), we get 
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