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In an interference experiment the ratio of amplitudes of coherent waves is a1/ a2 = 1/3 . The ratio of maximum and minimum intensities of fringes will be –

 (1) 9 

(2) 2 

(3) 18 

(4) 4

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Correct option  (4)  4

 Explanation:

a1 : a2 = 1 : 3

I1/I2 = (4/2)2 = 4 : 1

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