Question

Explain the function of a prism in dispersion of light.​

Answer 1

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What is the function of a despersive prism ?

Dispersive prisms are used to break up light into its constituent spectral colors because the refractive index depends on frequency.

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What happens when light is dispersed by a prism?

Visible light, also known as white light, consists of a collection of component colors.Upon passage through the prism, the white light is separated into its component colors - red, orange, yellow, green, blue and violet. The separation of visible light into its different colors is known as dispersion.

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What is a common example of dispersion?

Rainbow forms when sunlight hits the water droplets suspended in the atmosphere and undergoes total internal reflection. This dispersion or breaking up of light into several colors is what forms the rainbow. Hence, rainbow is an example of dispersion of sunlight.

Answer 2

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When white light is made to pass through a prism, a spectrum of seven colors is formed which shows that white light is a mixture of seven different colors. Prism only acts as a medium for the separation of the seven colors. When light falls on the glass prism, refraction takes place. Since the wavelength of different components of light is different and the frequency is constant, each component gets deviated by a different angle due to the difference in velocity in the glass medium. The red color having the maximum wavelength deviates the least and forms the upper part of the spectrum whereas violet having the least wavelength deviates the most