Question

what is deviation and how it relate with wave length​

Answer 1

Answer:

a difference from what is normal or expected, or from what is approved of by society

Because of the different indices of refraction for the different wavelengths of visible light, the angle of deviation varies with wavelength. Colors of the visible light spectrum that have shorter wavelengths (BIV) will deviated more from their original path than the colors with longer wavelengths (ROY).