A glass prims ABC (refractive index 1.5)...

A glass prims ABC (refractive index 1.5) , immersed in water (refrective index `4/3`). A ray of light is incident normally one face AB. If it is totally reflected at the face AC, then

`sin theta ge 8/9`

`sin theta ge 2/3`

`sin theta ge (sqrt3)/2`

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

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