First slide

Dispersion

Question

The angle of prism is 5° and its refractive indices for red and violet colours are 1.5 and 1.6 respectively. The angular dispersion produced by the prism is

Moderate

A

$7 {.75}^{\circ}$
B

$5^{\circ}$
C

$0 {.5}^{\circ}$
D

$0 {.17}^{\circ}$

Solution

$θ = (μ_{ı} - μ_{R}) A = (1 .6 - 1 .5) \times 5 = 0 {.5}^{\circ}$

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