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When a wave passes from one medium into another it may change speed and direction.

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1. Refraction and Snell's Law

You may recall that waves change speed when they pass from one medium into another - their frequency stays the same but their wavelength changes. This in turn cause a change in their direction as one side of the wavefront slows down or speeds up before the other.

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2. EM Wavespeed and Refractive Index

Little 'c' and how this is related to the refractive index of a material.

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3. Refraction Extra Points

A little bit extra on how, as the wave speed changes, this affects the wavelength and frequency of the wave.

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