1.

Two point monochromatic and coherent sources of light of wavelengthIare placed on the dotted line in front of an large screen.The souces emti waves in phase with each other.the distance betweenS_(1)&S_(2)is 'd'while theiri distance from the screen is much larger ,then, "rarrif d=7lambda//2,O will be a minima "rarrif d=4.3lambda,O there will be a total of 8minima on y axis "rarrif d=7lambda,O will be a minima "rarrif d=lambdathere will be only maxima on the screen.

Answer»

`1,2&3`
`2,3&4`
`1,2,3&4`
`1,3,&4`

Solution :since path difference at `O` is(2n-1)`lambda//2`so,O isa minima (2) as we MOVE up or down on the SCREEN path different becomes `7lambda//2,5lambda//2,3lambda//2,lambda//2` on both side so no of minima is`8`.
(3) Since path DIFFERNCE at `O` is `nlambda`,So`O` is maxima
As we move up or down on the screen PHASE different of point alwasys remain less than`lambda1` so there is only central maxima.


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