First slide

Prism

Question

Flint glass prism is joined by a crown glass prism to produce dispersion without deviation. The refractive indices of these for mean rays are 1.602 and 1.500 respectively. Angle of prism of flint prism is 10°, then the angle of prism for crown prism will be

Moderate

A

12°2.4`
B

12°4`
C

1.24°
D

12°

Solution

$For dispersion without deviation \frac{A}{A^{'}} = (\frac{μ_{y}^{'} - 1}{μ_{y} - 1}) ∴ \frac{A}{10} = \frac{(1 .602 - 1)}{(1 .500 - 1)} = \frac{0 .602}{0 .500} \Rightarrow A = 12^{\circ} 2 {.4}^{'}$

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