Refraction through a rectangular block (including wave front diagrams)
Lesson 3 / 27
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I can describe what refraction is, draw accurate diagrams of refraction and use the idea of wavefronts to explain what causes refraction.
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Refraction is when waves travel from one transparent medium to another, causing a change in direction.
When waves slow down, they turn towards the normal line (angle of incidence > angle of refraction).
When waves speed up, they turn away from the normal line (angle of incidence < angle of refraction).
Refraction can be investigated using a clear rectangular block, ray box and narrow slit, pencil, paper and a protractor.
Refraction occurs when one side of a wavefront enters the new medium before the other, causing a change in wave speed.
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