(b) If the principal source point S was to be moved a little upwards, towards the slit `S_(1)` from its usual symmetrical position with respect to the two slits `S_(1)andS_(2)` discuss how the interference pattern, obtained on the screen, would get affected.

(b) If the principal source point S was to be moved a little upwards,

1.	(b) If the principal source point S was to be moved a little upwards, towards the slit `S_(1)` from its usual symmetrical position with respect to the two slits `S_(1)andS_(2)` discuss how the interference pattern, obtained on the screen, would get affected.
Answer» If main source is shifted towards `S_(1)` the intensity `S_(1)` will be more and central bright on the screen will not remain as bright. The path difference of two rays meeting at central of screen will no more be zero. Fringe width and position of secondary maxima and will minima will also get affected.

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