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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
Answer is 2sin70°Hint : draw ray diagram label angles and use geometryRefractive index = sin70° / sinr= Sin 70° / sin 30° = 2sin70°
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