Young's double slit inteference apparatus is immersed in a liquid of refractive index 1.44. It has slit separation of 1.5 mm . The slits are illuminated by a parallel beam of light whose waveleng

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Young's double slit inteference apparatus is immersed in a liquid of refractive index 1.44. It has slit separation of 1.5 mm . The slits are illuminated by a parallel beam of light whose wavelength in air is 690 nm . The fringe-width on a screen placed behind the plane of slits at a distance of 0.72 m , will be :

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​ Δ W = d ⋅ μ λ D ​ = 1.5 × 1 0 − 3 × 1.44 690 × 1 0 − 9 × 0.72 ​ ⇒ Δ W = 2.3 × 1 0 − 4 m = 0.23 mm ​

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