A ray is incident at an angle 6 0 on side AB of a small angle prism ABC, of prism angle 3 0 . If r 1 and r 2 are the angles made by ray inside the prism with normals of side AB and AC respectively, then (r 1 + r 2 ) is :
Text Solution
Verified by ExpertsThe correct answer is:
D
Now r 2 and r 1 will be in opposite direction. By geometry.
A + (90 – r 1 ) + (90 + r 2 ) = 180 0 .... (i)
and 
= 1.5 .. (ii)
Solving r 1 = 4 0
r 2 = 1 0
r 1 + r 2 = 5 0
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