Question

Explain the concept of dispersion by a prism.​

Answer 1

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Dispersion of White Light By a Prism

Refraction is the bending in the path of the light when it travels from one medium to the another. The degree at which refraction will occur depends on the wavelength of the light. Each light wave has a different wavelength and will therefore deviate differently.

Answer 2

First of all what is Dispersion?

=> Dispersion is the phenomenon of splitting of white light into it's constituent colours after passing through a prism. A band of seven colours is obtained is called Dispersion of light.

Red colour has higher wavelength. Due to this it bends less also scattered less. Violet colour has less wavelength. Due to this it bends the most and scattered easily by dust particles etc.

What is prism?

=> It is a transparent medium bounded by two plane faces which are inclined to each other at an angle. And the angle between them is called refracting angle and angle of prism (A).

• Dispersion by a prism.

→ Refer the attachment for figure.

In fig. PQ is an incident ray. QR is a refected ray. RS is an emergent ray making an angle i1, i2, r1 and r2 respectively.

If incident ray is produced in the forward direction. We get $\angle{TKS}$ = $\delta$

Formula :

A + $\delta$ = i1 + i2.

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