An isoscales prism of angle 120o has a refrective index 1.44. Two parallel rays of monochromatic lig

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An isoscales prism of angle 120o has a refrective index 1.44. Two parallel rays of monochromatic light enter the prism parallel to each other in air as shown. The rays emerging from the opposite face

Accepted Answer

The diagramatic representation of the given problem is shown in figure
From figure it follows that ∠i = ∠A = 30^o
From Nell′s law n₁ sin i = n₂ sin r
or sin r =

= 0.72
Now, ∠δ = ∠r - ∠i = sin^-1 (0.72) - 30^o
∴ θ = 2(∠δ) = 2 {sin^-1(0.72) - 30^o}.

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