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A ray of light R 1 is incident on a glass slab at an angle equal to critical angle of glass-air system. The refracted ray R 2 undergoes partial reflection and refraction at other surface of slab. The angle between the reflected ray R 3 and refracted ray R 4 is

Options

  1. A45 °
  2. B135 °
  3. C105 °
  4. D95 °

Correct answer

C. 105 °

Step-by-step solution

sin ⁡ 45 ° sin ⁡ θ = 2 θ = 30 ° α = 180 ° - 30 ° + 45 ° = 105 °

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