This article discusses angle of incidence. A fundamental concept that appears in many areas of photography. Getting a grasp of this concept will open up a whole new realm of possibilities for you as you move forward in your career or hobby.
An incidence is simply an occurrence, an action that takes place at a specific point. In our case this incidence is the point at which a particle of light strikes a surface. The law of physics states that whenever an object strikes another object there will be an equal but opposite reaction. Because we are talking about a particle of light, when that particle hits a surface it deflects off that surface in a very predictable way. Let's take our first example, a highly reflective surface.