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9 votes
Derive a relation between critical angle and refractive index​

User Jgbarah
by
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1 Answer

10 votes

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

User Bye
by
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