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Light Waves — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 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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