ABSTRACT
If a light wave strikes a medium (such as a block of glass) at an angle, then the waves which enter the medium slow down and the wavelength
becomes shorter to compensate. This has the effect of altering the direction of travel of the wave.
If a light wave strikes a medium (such as a block of glass) at an angle, then the waves which enter the medium slow down and the wavelength
becomes shorter to compensate. This has the effect of altering the direction of travel of the wave.