Doubt from Wave Optics

please Mind in first the two D’are different jst it should be d in wavelength and d<<D …
Doubt is im neither getting the ans right nor understanding both the sol…
@LaveshGupta
@sonu_shaw
@Aastik_Guru
@Amish_1706

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Bro why path diff is 2D

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Bro it must of the form 2nD for the maximum intensity

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Got it bro thankss…
please try the second one also

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I have a doubt bro.Path difference=nlambda for maximum intensity so minimum n=1 so it should be d na??Why 2d?

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I think this helps
@Aastik_Guru

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Thanks.I didn’t remembered that it’s cos^2

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in second one,solution given is wrong bro.They wrote d in drnominator of only first term term that is n lambda and not in denominator of 40 um

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the asnwer obtained is correct we have to take 2d only but logic is different @VenkatAmith mixed both

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Oh,is it?
Can explain?

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explain pls why we have to take 2d and not d

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see at centre path difference is 3d and at infinity it is 0 so from 3d it decreases to 2d for least y.

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Bro you took out phase diff =2nlambda.We know 2pi detax/lambda =phase diff therefore delta x=nlambda

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maxima is obtained at centre which is corresponding to 3d then at y which is for 2d , did you got it?

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thanks @fogx_gofx
I am sorry guys @Abhinav.08 @Aastik_Guru , i mislead you…

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Areeee no prob bro it happens…

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Bro i am not satisfied…as after this correction also
Plzzz can u see once the sol again…

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are bro i am saying that the solution they have given is wrong.As when they bring d in denominator they have place d only in denominator of first term that is nlambda.They have forgot to place in denominator of 40 um.

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