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In Young’s double slit experiment, the 10th bright fringe is at a distance x from the central fringe. Then
a) the 10th dark fringe is at a distance of 19x/20 from the central fringe
b) the 10th dark fringe is at a distance of 21x/20 from the central fringe.
c) the 5th dark fringe is at a distance of x/2 from the central fringe.
d) the 5th dark fringe is at a distance of 9x/20 from the central fringe.

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b, c, d only

a, b, c only

a, b, c, d only

a, d only

answer is C.

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Detailed Solution

For bright band $x = N β;$

For dark band $x' = (N' - \frac{1}{2}) β$

$0 n dividing x' = x (\frac{N' - \frac{1}{2}}{N})$

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