Also question is, why does a glass slab not disperse white light?
In the case of a glass slab, the opposite sides are parallel and therefore different colors emerge parallel to each other and are seen simultaneously. Therefore,dispersion doesn't occur in a glass slab.
Subsequently, question is, why does a prism split white light? When white light enters the prism, each kind of light within white light (all the colors) are reflected at different angles because of the different wavelengths. This effectively separates all of the colors present in white light into different bands which we can see as the spectrum.
Similarly, it is asked, how is white light split into Colours?
White light is a mixture of many different colours, each with a different frequency . White light can be split up into a spectrum of these colours using a prism, a triangular block of glass or Perspex. This means that the light leaving the prism is spread out into its different colours, a process called dispersion .
Can a glass slab disperse white light?
Glass slab: The dispersion of light does occur in a rectangular glass slab during the first interface of air and glass slab. But, after being refracted through the second interface, all colours start moving parallel to each other which recombine together to give white light.
