1.

In a Young's interference experimental arrangement incident yellow light is composed of two wavelengths 5890 Å and 5895 do A. Distance between the slits is 1 mm and the screen is placed 1 m away.Order upto which fringes can be seen on the screen will be :

Answer»

384
486
512
589

Solution :`n lambda_(2) = ( n xx 1/2) lambda_(1)`
`therefore (lambda_(2))/(lambda_(1)) = ( n+ 1/2)/n`
`therefore n = 589`


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