refraction and dispersion notes

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refraction is when light rays bend/ change direction as they go through a medium. For example, when light goes through a glass prism, the rays bend.

dispersion is when White light goes through a transparent object and splits into the colour spectrum. This happens because each colour in the spectrum has a different wavelength so they refract/ bend differently.

A good way of remembering the colour spectrum is

Richard of York gave battle in vain

red orange yellow green blue indigo violet