Why does dispersion of white light dosent take place in any other medium other than prism.for example why does dispersion thake place in glass slab
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. If the two interface surfaces are parallel to each other, as in a 'slab' of glass, all of the bending (and dispersion) that takes place at the first interfaces is exactly reversed at the second interface.
regards toppers expert