There are many mysteries of physics for which you can find explanations online and some of those explanations are wrong. In this video, Fermilab’s Dr. Don Lincoln takes on the mystery of why light travels slower in water and glass. He lists a few wrong explanations and then shows you the real reason this happens.
Note: All videos are hosted by YouTube, Swoj.com did not produce this video. If you have any claim on the video then please follow through to Youtube and report at the source.