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Question

The intensity of the light coming from one of the slits in a Young's double slit experiment is double the intensity from the other slit. Find the ratio of the maximum intensity to the minimum intensity in the interference fringe pattern observed.

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Solution

Let the intensity of light coming from one slit I1=I
Intensity of light coming from other slit I2=2I
Maximum intensity Imax=(I1+I2)2
Or Imax=(I+2I)2=(2+1)2I
Minimum intensity Imin=(I2I1)2
Or Imin=(2II)2=(21)2I
Ratio ImaxImin=(2+1)2(21)2

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