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Derive the expression for the intensity at a point where interference of light occurs. Arrive at the conditions for maximum and zero intensity?
Its simple!Just think of two waves having Electric fields as:E1 = E0sinwt and E2 = E0sin(wt + o)where o is phase sshift of o.The resulatant electric field would be E1 + E2.Use sinc + sind formulaes and u would obtain as:Enet = 2E0coso/2 * sin(wt + o/2).Now u need to know taht:Intensity is always directly proprtion to square of electric field or amplitude.THus,I = Imaz * cos^2(o/2).
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