medium - the matter through which a wave travels, absorption - when light creates another type of energy, usually heat, reflection - when light bounces off an object, transparent - objects that allow all light to pass through, wavelength - the distance between one wave crest and the next crest; or one wave trough to the next trough, refraction - when light bends as it passes through an object, translucent - objects that some light can pass through, opaque - objects that light cannot pass through,

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