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Three narrow slits A, B and C are illumi...

Three narrow slits A, B and C are illuminated by a parallel beam of light of wavelength` lambda` , P is a point on the screen exactly in front of point A. Slit plane is at a distance D from the screen`(D gtgt lambda)`. It is know that `"BP – AP ="(1)/(3)`

(a) Find d in terms of D and` lambda`
(b) Write the phase difference between waves reaching at P from C and A.
(c) If intensity of P due to any of the three slits individu- ally is `I_(0)`, find the resultant intensity at P.

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