We wish to examine the irradiance produced on the plane of observation in Young's Experiment when the slits are illuminated simultaneously by two monochromatic plane waves of somewhat different frequency, E1, and E2, Sketch these against time, taking A! = 0.8A2. Now draw the product E1 E2 (at a point P) against time.
What can you say about its average over a relatively long interval? What does (E1 + E2)2 look like? Compare it with Ef + E\. Over a time that is long compared with the periods of the waves, approximate ((E1 + E2)2)T
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