Two coherent point sources S_(1) and S_(2) vibrating in phase emit light of wavelength lambda. The separation between the sources is 2 lambda. Consider a line passing 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 ?

Two coherent point sources S_(1) and S_(2) vibrating in phase emit lig

1.	Two coherent point sources S_(1) and S_(2) vibrating in phase emit light of wavelength lambda. The separation between the sources is 2 lambda. Consider a line passing 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 ?
Answer» `(5lambda)/(2)` `(3lambda)/(2)` `(7lambda)/(12)` `(3lambda)/(4)` ANSWER :C

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