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Unformatted text preview: Intensity in single-slit diffraction pattern We consider a monochromatic light passing through a narrow slit from the left to the right. Huygens’ principle implies that we have to consider each point in the slit as a separate source of spherical wavelets propagating in all directions to the right of the slit. The light falls on a screen which is assumed very far away, so the rays heading to any point are nearly parallel. We expect interference from waves originated at different points of the slit. Here we will discuss a method of predicting the amplitude and intensity of the light waves at any point on the interference pattern using the phasor technique that is a little bit different than in the text-book. We will find the amplitude and intensity of the wave created by interference of large number of waves originated at the slit at some point P at the screen. The position of the point P is characterized by its angular position ....
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