1.

In youngs double slit experiment 62 fringes are seen in visible region for sodium light of wavelength 5893a of violet of wavelength 4358a is used in place of sodium light then the number of fringes seen will be

Answer»

N1 = 62

w1 = 5893

w2 = 4358

total EXTENT of fringes is constant for both wavelengths

i.e. n1w1D/d = n2w2D/d

N2 =62×5893/4358 = 84 (approx)



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