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 on the face BC if.

`sin theta ge 8/9`

`sin theta ge 2/3`

`sin theta =(sqrt(3))/2`

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

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