Light waves form two coherent source having intensity ration `81:1` produce interference. Then, the ratio of maxima and minima in the interference pattern will be
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Here, `(I_(1))/(I_(2)) = (a^(2))/(b^(2)) = (81)/(1) :. (a)/(b) = (9)/(1) or a = 9 b` In the interference pattern `(I_(max.))/(I_(min.)) = (a + b)^(2)/(a - b)^(2) = (9b + b)^(2)/(9b - b)^(2) = (25)/(16)`
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