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 :(i) The ratio of amplitude of light waves from two sources is(a) 9:1 (b) 81 : 1(c) 1: 9 (d) 1 : 81(ii) For maximum intensity the value of cosϕ is(a) -1(b) +1(c) ∞(d) 0

If two waves having amplitudes a and b superimposes on each other and

1.	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 :(i) The ratio of amplitude of light waves from two sources is(a) 9:1 (b) 81 : 1(c) 1: 9 (d) 1 : 81(ii) For maximum intensity the value of cosϕ is(a) -1(b) +1(c) ∞(d) 0
Answer» Correct answer is (i)(a) (ii) b

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