refraction - When light travels from air into water, it slows down, causing it to change direction slightly. This change of direction is called refraction., refract - Make (a ray of light) change direction when it enters at an angle., reflection - an amount of light, heat, or sound that is reflected by a body or surface., spectrum - a band of colours, as seen in a rainbow, produced by separation of the components of light by their different degrees of refraction according to wavelength., ray - each of the lines in which light (and heat) may seem to stream from the sun or any luminous body, or pass through a small opening.,

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