In Young's double slit experiment an int...

In Young's double slit experiment an interference pattern is obtained for `lambda=6000Å` coming from two coherent sources `S_(1) and S_(2)` At certain point P on the screen third dark fringe is formed. Then the path difference `S_(1)P-S_(2)P` in microns is

`0.75`

`1.5`

`3.0`

`4.5`

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