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Two monochromatic light waves of amplitude A and 2A interfering at a point, have a phase difference of 60°. The intensity at that point will be proportional to :

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a

3A2

b

5A2

c

7A2

d

9A2

answer is C.

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Detailed Solution

I=I1+I2+2I1I2 cos∆ϕ∝A12+A22+2A1A2 cos∆ϕ ⇒I∝7A2

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Two monochromatic light waves of amplitude A and 2A interfering at a point, have a phase difference of 60°. The intensity at that point will be proportional to :