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olchik [2.2K]
2 years ago
8

Derive a relation between critical angle and refractive index​

Physics
1 answer:
Vera_Pavlovna [14]2 years ago
4 0

Answer:

At the critical angle the angle of refraction (outside the medium) is 90°

Ni sin θ = Na sin 90° = 1    assuming outside medium is air

sin θ = 1 / Ni            where Ni is the refractive of the medium involved

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