Light is what we see. It can be thought of either as a particle, (the photon), or as a wave. The photon we can easily think of as a small dot travelling through space at the speed of light. Each photon has a particular colour or energy. But how do we think of light as a wave? For this we need to know that light is also an "Electro-magnetic field" -- a combination of electric-field and magnetic-field -- the same thing that causes static electricity and magnets to attract (or repel) things. Light is just another way that this "field" is experienced. A light wave is an oscillating electro-magnetic field - just like a water wave is water with an oscillating surface. Photons are bosons, and have a quantum spin of 1. Light has the properties of both particle and waves. If we look for photons we will find them, but if we look for wave -l....

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