# act20ans - Do NOT write on these sheets or take them with...

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Do NOT write on these sheets or take them with you! The next class needs them too! PHYS-1200 PHYSICS II SPRING 2006 Class 20 Activity: Interference and Diffraction of Light Waves SOLUTION In this exercise, you will perform experiments to study the interference pattern of light that has been diffracted by passing through a single slit, and the interference pattern of light that has passed through a pair of slits (Young’s experiment). At your table you should have: An optical track A red laser A set of various double slits, and a set of various single slits mounted on disks A mounted viewing screen with metric scale THE LASER IS NOT A TOY. AVOID LOOKING DIRECTLY INTO THE LASER, AND DO NOT POINT IT WHERE ITS LIGHT MIGHT ENCOUNTER ANYONE’S EYE(S) Single Slit Diffraction In single slit diffraction, the first minimum of the diffraction pattern occurs at an angle given by the formula, a sin θ = λ , (1) where a is the width of the slit, θ is the angle at which a minimum occurs, and λ is the wavelength of the light used in the experiment. Make a copy of the table below on your paper, and record all data and calculated results in that table. DO NOT WRITE ON THIS SHEET! Then follow the steps below the table.

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