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A Young's double slit experiment is cond...

A Young's double slit experiment is conducted with slit separation 10mm, where the screen is 2m away from the slits. If wavelength of light used is `6000 Å` , answer the following
If the wavelength is increased by `1000 Å` , and the whole apparatus is placed in water of refractive index `4//3` , the new fringe width in mm is

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