A complete denition of the nature of light is complex. In fact, several
Nobel Prizes have been awarded for various contributions to the working
denition we use today. We will simplify our discussion by using a deni-
tion adequate for applied photography. If you are still curious aer reading
this, see any basic physics text.
Light is a type of energy called electromagnetic radiation. Electromagnetic
radiation travels through space in tiny “bundles” called photons. A photon
is pure energy and has no mass when at rest. A box of photons the size of an
elephant weighs nothing.
e energy ...
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