When I go to the pool, I often see light patterns on the wall as shown in these two videos:
I am trying to understand the physics behind these patterns.
My first question is: Are these patterns caused by light interference? That is, are the dark spots caused by destructive interference, and are the white parts caused by constructive interference? If this is some other phenomena, please explain.
If these are in fact light interference patterns, how does the light coming down from the window (this is in the morning, around 9 AM, and the sunlight is coming through a window at an angle) bounce off the water waves (I only see this happen when people are in the pool creating waves), and create these patterns. I would expect that the light of different frequencies bouncing off various parts of the water waves would just create a washed out white image on the wall. I don't really understand how all these different light frequencies, bouncing at different angles off of different heights of water waves could form interference patterns. Please explain.