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.

`sinthetagt=8//9`

`2//3ltsinthetalt8//9`

`sinthetalt=2//3`

It is not possible

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