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Question

If Young's double slit experiment is performed in water instead of air, then
  1. Fringe width would increase
  2. Fringe width would decrease
  3. Fringe width would remain unchanged
  4. No fringes would be seen

A
Fringe width would remain unchanged
B
No fringes would be seen
C
Fringe width would decrease
D
Fringe width would increase
Solution
Verified by Toppr

In water, speed of light decreases.
Since frequency remains same, therefore the wavelength must decrease.
The formula for fringe width is λDd.
Thus, fringe width decreases in water because wavelength of light decreases.

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