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If two light waves having same frequency...

If two light waves having same frequency have intensity ratio `4:1` and they interfere, the ratio of maximum to minimum intensity in the pattern will be

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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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