![]() As you can see in figure 2, the vectors I and R can be expressed in terms of the vector A and B: ![]() Simple! This is called the law of reflection.Ĭomputing the reflection direction when the incident direction and the surface normal are known is very simple. In other words, if the angle between the incident direction and the surface normal is denoted \(\theta_i\) and the angle between the reflected direction and the surface normal is \(\theta_r\), then \(\theta_i = \theta_r\). It bounces back in a direction which is symmetrical to the incident direction about the surface normal at the point of impact as shown in figure 1. What happens to this photon, is very similar to what happens to a tennis ball when it hits the surface of the floor. Reflection is the result of what happens to a photon, or an incident light beam if you are not familiar with the concept of photon, when it hits the surface of a reflective surface such as glass, water, or a sheet of aluminium for example. Let's start with reflection which is almost the simplest form of light-matter interaction. ![]() Figure 2: computing the reflection direction can be done using simple geometry. ![]()
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