MCQ
If Young's double slit experiment is performed in water:
- ✓The fringe width will decrease.
- BThe fringe width will increase.
- CThe fringe width will remain unchanged.
- DThere will be no fringe.
✓
Answer
Correct option: A.
The fringe width will decrease.
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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