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A glass prism of refractive index 1.5 is...

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

A

`sintheta ge 8/9`

B

`sintheta ge 2/3`

C

`sintheta=(sqrt3)/2`

D

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

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The correct Answer is:
A
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