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A monochromatic light is incident from air on a refracting surface of a prism of angle 75° and refractive index n0 = √3 . The other refracting surface of the prism is coated by a thin film of material of refractive index n as shown in figure. The light suffers total internal reflection at the coated prism surface for an incidence angle of θ ≤ 60°. The value of n2 is _______.

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For TIR at other face.

Snell law at first surface

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