First slide

Dispersion

Question

The refractive indices for the light of violet and red colours of any material are 1.66 and 1.64 respectively. If the angle of prism made of this material is 10°, then angular dispersion will be

Moderate

A

$0 {.20}^{\circ}$
B

$0 {.10}^{\circ}$
C

$0 {.40}^{\circ}$
D

1°

Solution

$θ = (μ_{v} - μ_{r}) A = (1 .66 - 1 .64) \times 10^{\circ} = 0 {.2}^{\circ}$

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