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.

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