A beam of light is partially reflected and partially refracted from a surface. The angle between the reflected and refracted light is 90^@. The angle of refraction is 30^@. The angle if incidence must be :

A beam of light is partially reflected and partially refracted from a

1.	A beam of light is partially reflected and partially refracted from a surface. The angle between the reflected and refracted light is 90^@. The angle of refraction is 30^@. The angle if incidence must be :
Answer» `50^@` `60^@` `75^@` `78^@` Answer :B

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A beam of light is partially reflected and partially refracted from a surface. The angle between the reflected and refracted light is 90^@. The angle of refraction is 30^@. The angle if incidence must be :

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