How can we say that refractive index of red is less than violet

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Solution

$R e f r a c t i v e space i n d e x space equals fraction numerator s p e e d space o f space l i g h t space i n space a i r over denominator s p e e d space o f space l i g h t space i n space m e d i u m end fraction n space equals c over v$

Also

v = f ×

v- velocity
f - frequency
- wavelength

That is refractive index is inversely proportional to v and also wavelength .

Hence as wavelength of red is more than violet
Therefore refractive index of red is less than that of violet.

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I: Refractive index for violet colour is maximum

II: Deviation produced for red colour is minimum

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