id: 5203,1
title: Snell’s Law states that light changes direction when changing speed.
date: 2022-10-23

Snell’s Law states that light changes direction when changing speed.

The refractive index of a material is how quickly light moves through it—light goes its maximum speed only in a vacuum. This is an important notion when considering a lens as the angle of incidence (angle at which light strikes the surface) is further modified by the refractive index. The speed of light in a material depends on the wavelength, so different wavelengths will bend differently. This is the driving force behind chromatic aberration.rK3