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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) ((2)/(3))`

B

`phi = cos^(-1) ((2)/(3))`

C

`phi = cos^(-1) ((1)/(3))`

D

`phi = cot^(-1) ((2)/(3))`

Text Solution

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The correct Answer is:
B
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