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In a Young's double slit experiment, usi...

In a Young's double slit experiment, using mono-chromatic light of wavelength `lambda`, the intensity of light at a point on the screen where the path defference is `lambda` is k units. Find the intensity at a point where the path difference is `lambda//3`.

Text Solution

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A path difference of A, corresponds to a phase difference of `2pi`
`therefore` intensity , `I=4a^2` or `a^2=I/4`
A path difference of `lambda/3` corresponds to a phase difference of `(2pi)/3`
`therefore` Intensity =`4xxI/4. cos^2 (2pi)/3`
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