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(a) How many bright fringes appear betwe...

(a) How many bright fringes appear between the first diffraction-envelope minima to either side of the central maximum in a double-slit pattern if `lambda 550 nm`, d = 0.180 mm, and `a = 30.0 mu m`? (b) What is the ratio of the intensity of the third bright fringe to the intensity of the central fringe?

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(a) 11, (b) 0.405
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