Question

Why does glass slab does not Cause dispersipn

Answer 1

Dispersion is the splitting up of white light (or a composite light) into its constituent colours. Dispersion occurs when light is passed through a prism. The dispersion is caused due to the the difference in the angle of deviation for different colours. 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. In a prism, the dispersion occurring at one face in enhanced by the refraction at the other face, but in a glass slab the dispersion occurring at one face is neutralized by refraction at the other face. Join the Forum discussion on this post

Read more at: http://www.askphysics.com/why-dispersion-does-not-occur-in-a-glass-slab/