Absorb - To soak up or take in, Lens - Optical device which focuses or disperses a light beam by means of refraction, Light Energy - Energy in the form of moving rays of light, Medium - Material through which a wave travels, Prism - A piece of glass that separates white light into colors of the spectrum., Reflection - The bouncing back of a wave when it hits a surface through which it cannot pass., Refraction - The bending of a wave as it passes at an angle from one medium to another, Transparent - Allowing light to pass through, Translucent - Allows some light to travel through, Opaque - not letting light through, Transmit - to send something across places; to pass along, Sound Energy - Energy caused by an object's vibrations, Sound waves - vibrating forms of energy that are made of molecules and look like waves, Pitch - a tone's experienced highness or lowness; depends on frequency, Frequency - the number of complete wavelengths that pass a point in a given time,

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