The Reflection coefficients are based on concepts introduced in our childhood. Imagine the case when you throw a ball at the vertical stone wall. The ball having its incident power will travel towards the stone wall, hit the wall which will soak up some of its power and then the remaining power, reflected power, will cause the ball to bounce back towards you.
The ratio of (reflected power)/(incident power) is known as the reflection coefficient. The reflection coefficient is often represented by the Greek letter gamma (G).
