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Two sources, in phase and a distance d a...

Two sources, in phase and a distance d apart, each emit a wave of wavelength l (as shown in the following figure). Which of the choices for the path difference `Delta L = Delta P = S_(2)P - S_(1)P Delta L = L_(1)-L_(2)` will always produce constructive interference at point P?

A

`d sin theta`

B

`lambda`

C

`(x // lambda)d`

D

`lambda // 2`

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The correct Answer is:
B
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