17. (a) What is dispersion of light?
(b) Explain how rainbows are formed?
(c) In the formation of white light by a prism, which colour is deviated least and
which colour is deviated most?
Answers
Answer:
A)In optics, dispersion is the phenomenon in which the phase velocity of a wave depends on its frequency. Media having this common property may be termed dispersive media. Sometimes the term chromatic dispersion is used for specificity.
B)A rainbow is caused by sunlight and atmospheric conditions. Light enters a water droplet, slowing down and bending as it goes from air to denser water. The light reflects off the inside of the droplet, separating into its component wavelengths--or colors. When light exits the droplet, it makes a rainbow
C)The bending of red component of white light is least while most for the violet component.
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(a) Scattering of White light into it's constituent colours (Violet , Indigo , Blue , Green , Yellow and Red colour) is called "Dispersion of light".
(b) Rainbow is formed by refraction, dispersion and total internal reflection of light and every water droplets act as a prism.
(c) In the formation of White light by a Prism, Red colour is deviated least and Violet colour is deviated most.