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A light ray is incident normally on the ...

A light ray is incident normally on the face AB of a right-angled prism ABC `(mu = 1.50)` as shown in the figure. What is the largest angle `phi` for which the light ray is totally reflected at the face AC?

A

`Phi = sin^-1 (frac(2)(3))`

B

`Phi = cos^-1 (frac(2)(3)`

C

`Phi = cos^-1 (frac(1)(3)`

D

`Phi = cot^1 (frac(2)(3))`

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