In a double slit experiment, the slits are separated by a distance d and the screen is at a distance D from the slits. If a maxima is formed just opposite to each slit, then what is the order of the fringe so formed?
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a
d22λD
b
2d2λD
c
d2λD
d
d24λD
answer is A.
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Detailed Solution
Let p be the position of a bright fringe at a distance xm from the centrexmbright =mλDd,m=0,1,2,3……… In the case xm=d2 Or m=d22λD