If Young's double slit experiment is performed in water, _________________ .

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the fringe width will decrease As fringe width is proportional to the wavelength and wavelength of light is inversely proportional to the refractive index of the medium, Here, \lambda_M = \lambda/\eta \lambda_M = 	ext{wavelength in medium} \lambda = 	ext{wavelength in vacuum} \eta = 	ext{refractive index of medium} Hence, fringe width decreases when Young's double slit experiment is performed under water.

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