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A light ray is incident perpendicular to one face of a 90^ prism and is totally internally reflected at the glass-air interface. If the angle of reflection is 45^ , we conclude that the refractive index n

Options

  1. An < 1 2
  2. Bn > 2
  3. Cn> 1 2
  4. Dn < 2

Correct answer

B. n > 2

Step-by-step solution

Angle of incidence i > C for total internal reflection. Here i =45^ inside the medium. aligned & 45^ > ⁻¹(1 / n) & n> 2 . aligned

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