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A glass prism of refractive index 1.5 i...

A glass prism of refractive index 1.5 is immersed in water (refractive index `4//3`) . A light beam normally on the face AB is totally reflected to reach on the face BC if

A

`sin theta ge 8/9`

B

`sin theta ge 2/3`

C

`sin theta ge (sqrt3)/2`

D

`2/3 lt sin theta lt 8/9`

Text Solution

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The correct Answer is:
A
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