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

Question

A glass prism ABC (refractive index 1.5), immersed in water (refractive index 4 3 ). A ray of light is incident normally one face AB . If it is totally reflected at the face AC , then, s i n θ ≥ 8 9, s i n θ ≥ 2 3, s i n θ ≥ 3 2, 2 3 s i n θ 8 9

MARKS App · Accepted Answer

For total internal reflection at face A C s i n θ > μ w μ g ⇒ s i n θ ≥ 4 3 × 1.5 ⇒ s i n θ ≥ 8 9

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