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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 and the screen 1 mm. The slits are illuminated by a parallel beam of light whose wavelength in air is `6300 Å`
a. calculate the fringe width.
b. One of the slits of the apparatus is covered by a thin glass sheet of refractive index 1.53. Find the smallest thickness of the sheet to bring athe adjacent minima on the axis.

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The correct Answer is:
[0.633 mm, 1.58 mm]
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