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Question

# If Young's double slit experiment is performed in water instead of air, thenFringe width would increaseFringe width would decreaseFringe width would remain unchangedNo 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
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#### 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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