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Intensity of Polarised Light

2 monochromat...

Question

2 monochromatic light waves of amplitude A and 2A interfering at a point, have a phase difference of 60°. Intensity at that point will be proportional to what?

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Solution

Dear Student ,
The Intensity at that point will be ,

$I = A^{2} + 4 A^{2} + 4 A^{2} \times \cos 60 ° = A^{2} + 4 A^{2} + 4 A^{2} \times \frac{1}{2} = 7 A^{2}$
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