9hw9 - Physics 315: Oscillations and Waves Homework 9: Due...

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Physics 315: Oscillations and Waves Homework 9: Due in class on Wednesday, Nov. 25th 1. An interference experiment employs two narrow parallel slits of separation 0 . 25 mm, and monochromatic light of wavelength λ = 500 nm. Estimate the minimum distance that the projection screen must be placed behind the slits in order to obtain a far-Feld interference pattern. 2. A double-slit of slit separation 0 . 5 mm is illuminated at normal incidence by a parallel beam from a helium-neon laser that emits monochromatic light of wavelength 632 . 8 nm. A projection screen is located 5 m behind the slit. What is the separation of the central interference fringes on the screen? 3. Consider a double-slit interference experiment in which the slit spacing is 0 . 1 mm, and the projection screen is located 50 cm behind the slits. As- suming monochromatic illumination at normal incidence, if the observed separation between neighboring interference maxima at the center of the projection screen is 2 . 5 mm, what is the wavelength of the light illuminat-
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9hw9 - Physics 315: Oscillations and Waves Homework 9: Due...

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