Refraction and Refractive Index _ GCSE Physics

The video tutorial explains how light changes direction when it travels between substances of different densities, a phenomenon known as refraction. It discusses how the angle of refraction is smaller than the angle of incidence when light enters a denser medium, and how it speeds up when passing through a less dense medium. The concept of refractive index is introduced, which quantifies how much light slows down in a medium compared to a vacuum. An example calculation is provided, demonstrating how to find the refractive index using angles of incidence and refraction. The tutorial concludes with the application of refractive indices in creating powerful lenses.

What does the acronym FAST help you remember in relation to refraction?

Explain the equation used to calculate the refractive index.