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JEE Main 24-Jan-2025 Paper - Shift 2 — JEE STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceJEEJEE Main 24-Jan-2025 Paper - Shift 24 Marks
MCQ
Young's double slit interference 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 :
  • ✓
    0.23 mm
  • B
    0.33 mm
  • C
    0.63 mm
  • D
    0.46 mm
✓

Answer

Correct option: A.
0.23 mm
(A) 0.23 mm
Sol. $\beta=\left(\frac{\lambda_0}{\mu}\right) \times \frac{D}{d}=\frac{690 \times 10^{-9} \times 0.72}{1.44 \times 1.5 \times 10^{-3}}=0.23 mm$

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