In a Young's double slit experiment, the path different, at a certain point on the screen, between two interfering waves is 18th of wavelength. The ratio of the intensity at this point to that at the centre of a brigth fringe is close to :
A
0.94
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B
0.74
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C
0.85
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D
0.80
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Solution
The correct option is D0.85 Δx=λ8 Δϕ=(2π)λλ8=π4 I=I0cos2(π8) II0=cos2(π8)