Reflection loss

Okay kiddo, imagine you are playing ball against a big wall. When you throw the ball against the wall, it bounces back to you, right? That's what reflection is! But sometimes, when the ball bounces back, it loses some of its energy and doesn't come back with the same strength. That's what we call reflection loss.

The same thing happens when we send waves, like light or sound, towards a surface. The waves hit the surface and bounce back, but sometimes they don't come back with the same intensity as they did when they first hit the surface. This loss of energy is called reflection loss.

This loss can happen because the surface might absorb some of the energy or scatter some of the waves in different directions, making them weaker. The more energy that gets lost during reflection, the less effective the wave will be at doing what we want it to do.

So, in summary, reflection loss is the loss of energy that happens when waves bounce off a surface and come back weaker than when they first hit it.