A Young's double slit experiment apparatus has slits separated by 0 . 2 mm and a screen 60 cm away from the slits. The whole apparatus is immersed in a liquid medium of refractive index 11 9 and the slits are illuminated with green light ( λ = 550 nm in vacuum). Find the fringe width of the pattern formed on the screen.

Question

A Young's double slit experiment apparatus has slits separated by 0 . 2 mm and a screen 60 cm away from the slits. The whole apparatus is immersed in a liquid medium of refractive index 11 9 and the slits are illuminated with green light ( λ = 550 nm in vacuum). Find the fringe width of the pattern formed on the screen., 0 . 95 mm, 1 . 25 mm, 1 . 35 mm, 1 . 45 mm

MARKS App · Accepted Answer

When a light wave enters a medium of refractive index μ , its wavelength becomes λ ' = λ μ . Fringe width in YDSE is given by β = λ ' D d = 550 × 10 - 9 × 60 × 10 - 2 11 9 × 2 × 10 - 4 = 1 . 35 mm .

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