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Light from two source, each of same frequency and travelling in same direction, but with intensity in the ratio 4 : 1 interfere. Find ratio of maximum to minimum intensity.

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`(I_("max"))/(I_("min"))=((sqrt(I_(1))+sqrt(I_(2)))/(sqrt(I_(1))-sqrt(I_(2))))^(2)`
`=((sqrt((I_(1))/(I_(2)))+1)/(sqrt((I_(1))/(I_(2)))-1))^(2)`
`=((2+1)/(2-1))^(2)=9 : 1`
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