In refraction, the wavelength of the light changes. But the frequency remains the same. But wavelength and velocity are inversely proportional to each other. So, when the wavelength changes, the frequency should also change. Please explain.
Two things change when light goes from one medium to another: the speed of the light and thewavelength of the light. But the frequency of the series of the light waves, passing a given point per second, does not change; thus the color does not change.
Let's say laser light of a certain color (for instance, green) is aimed at an aquarium full of water. The light enters one side, passes through the water, and emerges from the other side. If you are at the top of the aquarium looking in, you will see that the beam of light is the same color outside of the aquarium, as well as inside of the glass/water. The reason for this is because of the following important formula: