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In Young's double slit experiment the fr...

In Young's double slit experiment the fringes are fomred at a distance of 1 m from double slit of separation 0.12 mm calculate.
(i). The distance of 3rd dard band from the centre of the screen.
(ii). The distance of 3rd bright band from the centre of the screen, Given `lamda=6000Å`

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(i). For `m^(th)` dard fringe `x_(m)=(2m-1)(Dlamda)/(2d)` given D=1m=100cm, d=0.12mm=0.012cm
`x_(3)=((2xx3-1)xx100xx6xx10^(-7))/(2xx0.012)=1.25cm[becausem=3` and `lamda=6xx10^(-7)m]`
(ii). For `n^(th)` bright fringe `x_(n)=(nDlamda)/(d)impliesx_(3)=(3xx100xx6xx10^(-7))/(2xx0.02)=1.5xx10^(-2)m=1.5cm[becausen=3]`
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