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Physics Ray Optics Level: High School

Wave Optics

In a Young’s double-slit experiment , a set of parallel slits with a separation of 0.100 mm is illuminated by light having a wavelength of 589 nm and the interference pattern observed on a screen 4.00 m from the slits .

(a) What is the difference in path lengths from each of the slits to the screen location of a third-order bright fringe ?

(b) What is the difference in path lengths from the two slits to the screen location of the third dark fringe away from the center of the pattern ?