College Physics 10th Edition by Raymond Serway,Chris Vuille

Exercise 25

Laser light with a wavelength of 632.8 nm is directed through one slit or two slits and allowed to fall on a screen 2.60 m beyond. Figure P24.63 shows the pattern on the screen, with a centimeter ruler below it. Did the light pass through one slit or two slits Explain how you can tell. If the answer is one slit, find its width. If the answer is two slits, find the distance between their centers.