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Light Waves — Physics STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 SciencePhysicsLight Waves1 Mark
Question
If Young's double slit experiment is performed in water:
  1. The fringe width will decrease.
  2. The fringe width will increase.
  3. The fringe width will remain unchanged.
  4. There will be no fringe.
✓

Answer

  1. The fringe width will decrease.
Explanation:
As fringe width is proportional to the wavelength and wavelength of light is inversely proportional to the refractive index of the medium,
Here,
$\lambda_\text{M}=\frac{\lambda}{\eta}$
$\lambda_\text{M}$ = wavelength in medium
$\lambda$ = wavelength in vacuum
$\eta$ = refractive index of medium
Hence, fringe width decreases when Young's double slit experiment is performed under water.

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