reflection - When light hits a mirror, Refraction - when Light passes through a lens, opaque - something that light doesn't pass through, translucent - lets some light through, transparent - lets all light through, convex - type of lens that focusses light, concave - type of lens that splits light, gamma waves - part of the EM spectrum that can kill bacteria from food, ultraviolet - part of the EM spectrum that causes sunburn, infrared - part of the EM spectrum that is used in remote controls,

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