In a Young's double slit experiment, I 0 is the maximum intensity and β is the fringe width. Intensity at point P which is distance x from central maxima is

Question

In a Young's double slit experiment, I 0 is the maximum intensity and β is the fringe width. Intensity at point P which is distance x from central maxima is, I 0 cos πx β, 4 I 0 cos 2 π x β, I 0 cos 2 π x β, I 0 4 cos 2 π x β

MARKS App · Accepted Answer

Path difference at point P = x d D ∴ phase deff at. P = 2 π λ x d D = 2 π x β ∴ Intensity at P = I + I + 2 I cos 2 π x β = 2 I 1 + cos 2 π x β ∵ I 0 = 4 I = 4 I cos 2 π x β = I 0 cos 2 π x β

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