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Dispersion through Prisms

A thin prism ...

Question

A thin prism angle $3^{o}$ deviates a ray of light through $2^{o}$ while passing through it find the refractive index of the material of the prism?

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Solution

Deviation $δ = (μ - 1) A$
Or $2 = (μ - 1) 3$
$⟹ μ = 1.67$

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