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A ray of light travelling in water is incident on a glass plate immersed in it. When the angle of incidence is 51 o , the reflected ray is totally polarized. Find out the refractive index of glass. [The refractive index of water is 1 . 3 and tan 51 o = 1 . 235 ]

Options

  1. A1 . 605
  2. B1 . 305
  3. C1 . 33
  4. D1 . 805

Correct answer

A. 1 . 605

Step-by-step solution

μ g μ w = sin ⁡ i sin ⁡ r = tan ⁡ i ; for total plane polarization. r=90-i μ g = μ w × tan ⁡ 51 = 1.605

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