why does the white light disperse on the first face of the prism while it only refracts on the second face?
plz answer ASAP
Answers
Casue white light is made up of seven colours which at the first surface of the prism disperse (because of their different speeds in it) and at the second surface they refract.
hi,
A light ray is refracted when it passes from one medium to another at an angle and its speed changes. At the interface, it is bent in one direction if the material it enters in denser medium and in the OTHER direction if the material is less dense. Because different wavelengths of light travel through a medium at different speeds, the amount of bending is different for different wavelengths. Violet is bent the most and red the least because violet light has a shorter wavelength, and short wavelengths travel more slowly through a medium than longer ones do. Because white light is made up of ALL visible wavelengths, its colors can be separated by this difference in behavior.
When light passes through glass, it encounters TWO interfaces--one entering and the other leaving. It slows down at the first interface and speeds back up at the second.
hope this helps you