Question

Which colour deviate minimum during the dispersion oh light through a prism?

Answer 1

In vibgyor pattern red has maximum wavelength, so it cover maximum distance without deviation, but Violet has minimum wavelength, so it gets spread all over the atmosphere, so deviation is more.

And we can analyze it by Snell's law…

For Violet refrective index of glass is maximum so angle of deviation is more.

Answer 2

It's red colour which deviate min. during the dispersion of light through a prism