First slide

Dispersion

Question

The deviation caused in red, yellow and violet colours for crown glass prism are 2.84°, 3.28° and 3.72° respectively. The dispersive power of prism material is

Moderate

A

0.268
B

0.368
C

0.468
D

0.568

Solution

$ω = \frac{δ_{V} - δ_{R}}{δ_{Y}} = \frac{3 .72 - 2 .84}{3 .28} = 0 .268$

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