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###### P (a) How many bright fringes appear between the first diffrac-P tion-envelope minima to either side...

P (a) How many bright fringes appear between the first diffrac-P tion-envelope minima to either side of the central maximum in a double-slit pattern ifA 550 nm, d 0.150 mm, and a - 30.0 pm? (b) What is the ratio of the intensity of the third bright fringe to the intensity of the central fringe? ssm

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