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A pair of slits, separated by 0.150 mm, is illuminated by light having a wavelength of ? = 631 nm. An interference pattern is observed on a screen 156 cm from the slits. Consider a point on the screen located at y = 1.50 cm from the central maximum of this pattern.

(a) What is the path difference d for the two slits at the location y?

(b) Express this path difference in terms of the wavelength.

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