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A light ray incidents normally on one surface of an equilateral prism. The angle of deviation of the light ray is (refractive index of the material of the prism = 2 )

Options

  1. A60^
  2. B30^
  3. C0^
  4. D120^

Correct answer

A. 60^

Step-by-step solution

Given, i=0^ So, aligned i r₁ & = 2 0^ r₁ & = 2 r₁ & =0 or r₁=0 aligned Now, r₂ e = 1 e= 2 r₂ But, r₁+r₂=60^ So, aligned e & = 2 60^ & = 2 3 / 2>1 aligned So, light is incidenting at more than critical angle and totally internally reflected. aligned Deviation angle & =(i+e)- (r₁+r₂ ) & =0-60^ =60^ ( in magnitude ) aligned

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