Question

7. The refractive indices for light of violet, yellow and
red colours for glass are respectively 1.632, 1.620 and
1.613. Find the dispersive power of glass.
Ans. 0.0306.
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Answer 1

Answer:

For crown glass:

ω=μy−1μv−μr=1.5170−11.5318−1.5140=0.034

For flint glass:

ω=μy−1μv−μr=1.6499−11.6852−1.6434=0.064

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