NEET Physics Wave Optics Questions Solved

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In Young's double slit experiment, 62 fringes are seen in visible region for sodium light of wavelength 5893 Å. If violet light of wavelength 4358 Å is used in place of sodium light, then number of fringes seen will be 

(1) 54

(2) 64

(3) 74

(4) 84

(4) n1λ1=n2λ2

62×5893=n2×4358

n2=84.

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