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A ray of light is incident at an angle i...

A ray of light is incident at an angle i on a glass slab of refractive index u. The angle between reflected and refracted light is 90". Then the relationship between `I and mu` is

A

`I = tan^(-1) ((1)/(mu))`

B

`tan I = mu`

C

`sin I = mu`

D

`cos I = mu`

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