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  4. If Youngs double slit experiment is performed in water instead of air, then :

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Q. If Youngs double slit experiment is performed in water instead of air, then :

WBJEEWBJEE 2006

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.