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.

Three narrow slits A, B and C are illuminated by a parallel beam of li

1.	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.
Answer» Correct Answer - `(a)sqrt((2Dlambda)/(3))` `(b)(8pi)/(3)` `(c)3I_(0)`

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