Q. 185.0( 1 Vote )

In Young’s double

Answer :

Consider the following diagram.

D = 1m; d = 1.5 × 10-3 m; λ1 = 650 × 10-9 m; λ2 = 520 × 10-9 m


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Let y be the distance of the third bright fringe from the central maxima.


Let that the ‘n’th bright fringe of 650 nm wavelength coincides with ‘n+1’th bright fringe of 520 nm wavelength at a distance y from the central maximum.








Distance from central maxima =



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