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Light waves are refractedcloserefractionProcess by which a wave changes speed and sometimes direction upon entering a denser or less dense medium, eg a light ray changes direction when refracted by a lens. as they enter the glass because they are slowed down.

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There is an easy way to remember the order of the colours of white light by using a sentence: Richard Of York Gave Battle In Vain

White light can be split up to form a spectrumclosespectrumRefers to the visible spectrum, the range of the electromagnetic spectrum visible to the human eye. It can be seen when white light is split by a prism, or by raindrops to form a rainbow. using a prismcloseprismA block of glass or other transparent material that disperses light to form a spectrum..