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A ray of light entering from air into a ...

A ray of light entering from air into a denser medium of refractive index `(4)/(3)`, as shown in figure
The light ray suffers total internal reflection at the adjacent surface as shown. The maximum value of angle `theta` should be equal to :

A

`sin^(-1)"" (sqrt(7))/(3)`

B

`sin^(-1)""(sqrt(5))/(4)`

C

`sin^(-1)""(sqrt(7))/(4)`

D

`sin^(-1)""(sqrt(5))/(3)`

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