Which of the following colours of light undergoes the least deviation while passing through a glass prism ?

Red

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Blue

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Yellow

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Green

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Solution

The correct option is A Red
Red goes through least deviation because it has highest speed among VIBGYOR.
We know, $ν \times λ = c$
Frequency is a constant quantity.
also,
$μ = \frac{v e l o c i t y o f l i g h t i n v a c u u m}{v e l o c i t y o f l i g h t i n a m e d i u m}$
.
so refractive index will be very less for red color and hence show least deviation.

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