Two waves having the intensities in the ratio of 9 : 1 produce interference. The ratio of maximum to the minimum intensi
I_max/I_min=(√I1+√I2)^2/(√I1-√I2)^2=(3+1)^2/(3-1)^2=16/4=4.
Ref: NCERT Physics Class 12 Chapter 10 Wave Optics
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