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A ray of light is incident at an angle of 70 degree into a medium having refractive index u. the reflected and the refracted rays are found to suffer equal deviations in opposite direction. then u equals to- tan70 degree 2sin70 degree cosec70 degree none of these

A ray of light is incident at an angle of 70 degree into a medium having refractive index u. the reflected and the refracted rays are found to suffer equal deviations in opposite direction. then u equals to-
  1. tan70 degree
  2. 2sin70 degree
  3. cosec70 degree
  4. none of these

Grade:12th pass

1 Answers

Ajai
13 Points
3 years ago
Answer is  2sin70°
Hint : draw ray diagram label angles and use geometry
Refractive index = sin70° / sinr
= Sin 70° / sin 30°  = 2sin70°

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