A double-slit apparatus is immersed in a liquid of refractive index 1 . 33 . It has slit separation of 1 mm and distance between the plane of slits and screen is 1 . 3 m . The slits are illuminated by

Question

A double-slit apparatus is immersed in a liquid of refractive index 1 . 33 . It has slit separation of 1 mm and distance between the plane of slits and screen is 1 . 3 m . The slits are illuminated by a parallel beam of light whose wavelength in air is 6300 Å . Calculate the fringe width.

TestHub · Accepted Answer

Given μ = 1.33 , d = 1 mm , D = 1 .33 m , λ = 6300 Å The wavelength of light in the given liquid λ ′ = λ μ = 6300 1 .33 Å = 4737 Å = 4737 × 10 - 10 m Fringe width, w = λ ′ D d w = 4737 × 10 - 10 m 1.33 m 1 × 10 - 3 m = 6.3 × 10 - 4 m

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