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Question

White light is used to illuminate the two slits in YDSE. The separation between the slits is b and the screen is at a distance d (>>b) from the slits. At a point on the screen directly in front of one of the slits, certain wavelengths are missing. Some of these missing wavelengths are


A

λ=b2d

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B

λ=2b2d

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C

λ=b23d

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D

λ=2b23d

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Solution

The correct options are
A

λ=b2d


C

λ=b23d


O1P=y=b2

Δx=S2PS1P=ybd

=(b22)d=b22d

Wavelength are missing for,

Δx=λ12,3λ22,5λ32

λ1=2Δx=b2d,λ2=2Δx3=b23d,λ3=2Δx5=b25d


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