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Q. 19

A Young’s double

Class 11th HC Verma - Concepts of Physics Part 1 17. Light Waves

Answer :

Given, separation between the slits

The distance between the screen and the slit,

Wavelength of light,

refractive index of water,

Now, the fringe width is given by

But as the light is passing through water, its wavelength changes.

Therefore,

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