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

Question

Ajai · Answer

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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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-

tan70 degree

2sin70 degree

cosec70 degree

none of these

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