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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