Refraction, Change in direction of a wave when it passes from one medium to another, Medium, The material that a wave passes through (e.g. air), Normal, An imaginary line that extends out from a surface at 90 degrees, Angle of incidence, The angle between the incoming ray and the normal, Angle of refraction, The angle between the ray and the normal after it's entered a new medium, Refractive index, The ratio of the speed of a wave in one medium compared with a second medium .

Refraction BTEC

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