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Q. 45

Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
Found in: Page 957

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Short Answer

White light incident on a diffraction grating produces rainbows of diffracted light. What is the width of the first-order rainbow on a screen behind the grating?

On a screen behind the grating, the breadth of the rainbow is

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Step by Step Solution

Step: 1 Diffraction grating:

A optical device is an device that splits multicoloured light into its beam is split (disperses colors). The polychromatic light received on the grating is scattered, ends up in each wavelength becoming reflected at a replacement angle from the grating.

Step: 2 Finding position:

The fringe position by

The angle by

Step: 3 Finding the width:

Two variable wavelength by


The rainbow width by

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