A) no fringes would be seen
B) fringe width would decrease
C) fringe width would increase
D) fringe width would remain unchanged
Correct Answer: B
Solution :
Fringe width, \[\beta =\frac{D\lambda }{d}\]or \[\beta \propto \lambda \] If the experiment is performed in water, wavelength \[\lambda \] decreases, so, fringe width also decreases.
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