First slide

Dispersion

Question

A narrow beam of white light goes through a slab having parallel faces

Easy

A

the light never splits in different colours
B

the emergent beam is white
C

the light inside the slab does not split into different colours
D

the light inside the slab is white

Solution

Refraction of light of different wavelength is shown in the figure. The light inside slab clearly splits up into different colors. The emergent ray from a single white ray is a beam of different colors, parallel to the incident ray. However the emergent beam is white, as all the light rays are parallel to incident light . No angular dispersion is observed in emergent ray.

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