light - a form of energy that we can see, ray - beam of light energy, transparent - light can pass through, translucent - only some light can pass through, opaque - no light can pass through, direction - the path or way that something is going, visible - able to be seen, speed - how fast or slow something is going, wave - a way of transferring energy from one place to another, medium - the matter through which energy waves travel (solid, liquid, gas),

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