When white light passes through a prism, it is divided into its constituent colours. This is because of:
 

Concept: Dispersion of light refers to the separation of a composite beam of light into its constituent hues.

White light disperses because the hues of white light move at different rates through the glass prism.

Sir Isaac Newton discovered the dispersion.

Newton found that light is composed of seven distinct hues.

The refractive index, as we know, is defined as the ratio of the speed of light in a vacuum to the medium, i.e.

Refractive index

According to Cauchy's formula, refractive index of a material depends on the wavelength of light falling on it as

Where A, B, C....... are constants.

According to the aforementioned relationship, the refractive index is inversely proportional to the wavelength of the light employed.

As the refractive index v