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Using a light of wavelength 4800 Å in Fresnel’s biprism experiment, 21 fringes are obtained in a given region.

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Using a light of wavelength 4800 Å in Fresnel’s biprism experiment, 21 fringes are obtained in a given region. If light of wavelength 5600 Å is used, the number of fringes in the same region will be 

(A) 14 

(B) 18

(C) 21 

(D) 24.

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1 Answer

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by (32.9k points)

Correct option is (B) 18

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