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A Young's double slit set up for interference is shifted from air to within water, then the fringe width U&K CET 2011]

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decreases

increases

becomes infinite

remain unchanged

answer is B.

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Detailed Solution

When a Young's double slit set up for interference is shifted from air to within water, then the fringe width decreases.

Fringe width in air = $β = \frac{λ D}{d}$

Fringe width in water = $β^{'} = \frac{λ D}{μ d}$

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