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A double slit apparatus is immersed in a...

A double slit apparatus is immersed in a liquid of refractive index 1.33. It has slit separation of 1 mm and distance between he plane of slits and screen is 1.33 m. The slits are illuminated by a parallel beam of light whose wavelength in air is `6300 oversetcircA`
One of the slits of the apparatus is covered with a thin glass sheet of refractive index 1.53. Find the smallest thickness of the sheet to bring the adjacent minimum on the axis.

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