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If two waves having amplitudes a and b superimposes on each other and resultant amplitude is A = √(a2 +b2 +2ab cosϕ), where ϕ = phase constant.Intensity (I) is directly proportional to square of amplitudeI ∝ A2I ∝(a2 +b2 + 2ab cosϕ)In constructive interference Imax = (a +b)2In destructive interference lmin = (a -b)2Light waves from two coherent sources producing interference have intensity ratio 81:1.Using these information choose correct option from the following :The ratio of maxima and minima in the interference pattern is(a) 9: 1(b) 81 : 1(c) 25 : 16(d) 16 : 25 |
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Answer» Correct answer is (b) 81 : 1 |
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