A glass prism A B C (refractive index 1.5 ) , immersed in water (refractive index 4 3 ). A ray of light is incident normally on face A B . If it is totally reflected at face A C , then

\;{√{3}}/{2}" class="fm-inline"> sin θ > √ 3 2

sin ‌ θ > ‌ √ 3 2 ‌ 2 3 < sin ‌ θ < ‌ 8 9 Solution: For total internal reflection at face A C \;{µ_{w}}/{µ_{g}} " class="fm-inline"> sin ‌ ∧ i > ‌ µ w µ g ⇒ ‌ ‌ sin ‌ θ ≥ ‌ 4 3 × 1.5 ⇒ sin ‌ θ ≥ ‌ 8 9" >