In the Young's double slit experiment, if the phase difference between the two waves interfering at a point is ϕ, the intensity at that point can be expressed by the expression
A
I=√A2+B2+2ABcosϕ
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B
I=ABcosϕ
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C
I=A+Bcosϕ2
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D
I=A+Bcosϕ
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Solution
The correct option is DI=A+Bcosϕ I=a21+a22+2a1a2cosϕ Put a21+a22=A and a1a2=B,∴I=A+Bcosϕ