In a young 's double slit experiment, 12...

In a young 's double slit experiment, 12 fringes are observed to be formed in a certain segment of the screen, when light of wavelenght 600 nm is used. If the wavelenght of light is changed to 400 nm. Number of fringes observed in the same segment of the screen is given by

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The correct Answer is:

`n_(1)lambda_(1) = n_(2)lambda_(2) rArr 12 xx 600 = n_(2) xx 400 or n_(2) = 18`

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