Materials such as white glass and thin paper scatter the light rays in many random, unpredictable directions as they pass through. This is called diffuse transmission

describing the light implies seeing the light well enough to know whether to shoot or to wait until conditions improve.

Notice that the strength of the field moves from zero to its maximum-positive strengths and then back to zero; it then repeats the pattern in the negative direction. This is why the field around a beam of light does not attract metal like an iron magnet does. The field around a photon of light is positive half of the time and negative the rest of t

Refraction

that usually works—but not

Light is a type of energy called electromagnetic radiation. Electro magnetic radiation travels through space in tiny “bundles” called photons. A photon is pure energy and has no mass. A box of photons the size of an elephant weighs nothing.

The concept is easy because we use it daily. Reflection makes vision possible. We do not see objects; we see light.

Light rays from a low-contrast source strike the subject from many different angles.

Absorption