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COMEDK2012PhysicsRay Optics

A ray of light passing from glass to water is incident on the glass-water interface at 65^ . If the critical angle for the pair of media is 63^ .

Options

  1. AThe ray will emerge into water with a deviation of 2^ from the normal
  2. BThe ray will be refracted into water with a deviation of 2^
  3. CThe ray will be totally internally reflected back into glass with a deviation of 50^
  4. DThe ray will be totally internally reflected back into glass with a deviation of 2^

Correct answer

C. The ray will be totally internally reflected back into glass with a deviation of 50^

Step-by-step solution

Given, i=65^ and i_ c =63^ Since, i>i_ c , so the ray undergo total internal reflection. The angle of deviation, d= -2 i =180^ -2 (65^ )=180^ -130^ =50^

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