Physics II Lab w answers_Part_60

Physics II Lab w answers_Part_60 - Experiment 22...

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131 Experiment 22 Diffraction at a single and double slit Apparatus: Optical bench, He-Ne Laser, screen with slits, photo cell, micro meter. Purpose of the experiment: To measure the intensity distribution due to single and double slits and to measure the slit width (d) and slit separation (a). Basic Methodology: Light from a He-Ne Laser source is diffracted by single and double slits. The resulting intensity variation is measured by a photo cell whose output is read off as a current measurement. I. Introduction: I.1 Single slit diffraction We will study the Fraunhofer diffraction pattern produced by a slit of width ‘a’ . A plane wave is assumed to fall normally on the slit and we wish to calculate the intensity distribution produced on the screen. We assumed that the slit consists of a large number of equally spaced point sources and that each point on the slit is a source of Huygen’ s secondary wavelets which interfere with the wane lets emanating from other secondary points. Let the point sources be at A
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This note was uploaded on 11/26/2011 for the course PHY 2053 taught by Professor Lind during the Fall '09 term at FSU.

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Physics II Lab w answers_Part_60 - Experiment 22...

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