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Q.

In an interference pattern, at a point there observe 16th order maximum for λ1=6000 A0 .What order will be visible here if the source is replaced by light of wavelength λ2=4800 A0 ?

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answer is 20.

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Detailed Solution

The distance of nth maxima from central maxima is given by yn=nDλd, for yn to be constant, nλ =  constant. Thus n1λ1=n2λ2
∴n2=n1λ1λ2=16×60004800=20

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In an interference pattern, at a point there observe 16th order maximum for λ1=6000 A0 .What order will be visible here if the source is replaced by light of wavelength λ2=4800 A0 ?