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Question

A ray OA is incident upon a smooth surface POQ. It is reflected back along OB, a normal ON is drawn perpendicular to the surface at O (the point of incidence) and the value of AOP is 60. Find the value of x in degrees.
  1. 30

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Solution

The correct option is A 30
AOP+AON=90
(as ON is perpendicular to POQ)
Given, AOP=60
AON=9060
AON=30

By the laws of reflection,
AON=BON=x
Thus, x=30

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