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Question

Two coherent sources of intensity ratio 9:4 produce interference. The intensity ratio of maxima and minima of the interference pattern is:

A
13:5
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B
5:1
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C
25:1
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D
3:2
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Solution

The correct option is C 25:1
Given : I2I1=94
Maximum intensity Imax=(I1+I2)2
Minimum intensity Imin=(I1I2)2
Thus ratio of maximum to minimum intensities ImaxImin=(1+I2I1)2(1I2I1)2
ImaxImin=(1+32)2(132)2
Or ImaxImin=(2+3)2(23)2=251

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