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Q.

If two coherent sources are vibrating in phase then we have constructive interference at any point P whenever the path difference is

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a

$(n - \frac{1}{2}) λ$

b

$\frac{n λ}{2}$

c

$n λ$

d

$(n + \frac{1}{2}) λ$

answer is D.

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Detailed Solution

When $p a t h d i f f e r e n c e = n λ (n = 0, 1, 2 . . .)$ the resultant intensity is 4I₀.

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