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In Young’s double-slit experiment, an in...

In Young’s double-slit experiment, an interference pattern is obtained on a screen by a light of wavelength `6000overset@A`, coming from the coherent sources `S_1` and `S_2`.At certain point P on the screen, third dark fringe is formed. Then the path difference `S_1P-S_2P` in microns is

A

(A) 0.75

B

(B) 1.5

C

(C) 3.0

D

(D) 4.5

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