The coherent point sources S(1) and S(2)...

The coherent point sources `S_(1)` and `S_(2)` vibrating in same phase emit light of wavelength `lambda`. The separation between the sources is `2lambda`. Consider a line passingh through `S_(2)` and perpendicular to the line `S_(1)S_(2)`. What is the smallest distance from `S_(2)` where a minimum of intensity occurs due to interference of waves from the two sources?

`(7lambda)/(12)`

`(15lambda)/(4)`

`(lambda)/(2)`

`(3lambda)/(4)`

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