Answered: Discuss in detail the formation of…

Glencoe Physics: Principles and Problems, Student Edition

1st Edition

ISBN:9780078807213

Author:Paul W. Zitzewitz

Publisher:Paul W. Zitzewitz

Chapter18: Refraction And Lenses

Section: Chapter Questions

Problem 81A

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Discuss in detail the formation of rainbows.

Expert Solution

Step 1 Dispersion of light

Visible light have seven frequency bands that each corresponds to a different color.

The order of color is: red, orange, yellow, green, blue, indigo and violet.

The separation of visible light in seven is called dispersion of light.

The refraction of different color is different, because of this property of light dispersion occurs.

The speed of different color in refracting medium is different. Speed of red color is highest while speed of violet color is lowest.

Therefore, refractive index of the medium is lowest for red color and highest for violet color. As a result bending of violet color is maximum and that of red color is minimum.

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