Okay kiddo, so imagine you have two pairs of sunglasses, one with red lenses and one with green lenses. Now, if you wear the red lenses, everything you see will have a reddish tint, right? And if you wear the green lenses, everything you see will have a greenish tint.
Well, scientists use something called Mueller calculus to figure out how different materials and objects affect light that passes through them. They use special instruments to measure things like polarization, which means the direction that light waves move.
Just like your different colored sunglasses can change the way you see things, these materials and objects can change the way light looks and behaves. Scientists use Mueller calculus to calculate and describe those changes in a very detailed way.
With Mueller calculus, they can study things like the way light passes through clouds or how it interacts with different types of glass. This helps them understand more about our world and can even help improve technologies like cameras and telecommunications.