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A ray of light falls on a glass plate of...

A ray of light falls on a glass plate of refractive index `mu=1.5`.
What is the angle of incidence of the ray if the angle between the reflected and
refracted rays is `90^@`?

A

`30^(@)`

B

`sin^(-1)((2)/(3))`

C

`tan^(-1)((2)/(3))`

D

`tan^(-1)((3)/(2))`

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