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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 4359 Å is used in place of sodium light, then what is the number of fringes seen?

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From young’s double slit experiment,

λ = 5893 Å ; λ = 4359 Å

The above condition is total extent of fringes is constant for both wavelengths.

n2 = 84

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