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A ray of light is incident at an angle of incidence, i, on one face of prism of angle A (assumed to be small) and emerges normally from the opposite face. If the refractive index of the prism is $μ$ , the angle of incidence i, is nearly equal to :

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$\frac{A}{μ}$

$\frac{2 A}{μ}$

$μ A$

$\frac{A}{2 μ}$

answer is A.

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Detailed Solution

For normally emerge e = 0

Therefore r₂= 0 and r₁ = A

Snell’s Law for Incident ray’s

1sin i = $μ$ sin r i = $μ$ sin A

For small angle

i = $μ$ A

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