College Physics 10th Edition by Raymond Serway,Chris Vuille

Exercise 50

A pair of slits, separated by 0.150 mm, is illuminated by light having a wavelength of = 643 nm. An interference pattern is observed on a screen 140 cm from the slits. Consider a point on the screen located at y = 1.80 cm from the central maximum of this pattern. (a) What is the path difference for the two slits at the location y (b) Express this path difference in terms of the wavelength. (c) Will the interference correspond to a maximum, a minimum, or an intermediate condition