light changing direction when it goes through the water, Refraction, a measure of the amount of light produced, Lux, a band of coloured lights into which light may be separated, Spectrum, to send something out, Emit, a substance that is found in another substance, Impurity, Take in liquid,gas or other from the surface, Absorb, A clear object which separates light that passes through it, Prism, Parts of something that form a whole, Constituent.

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