Q. In Young's double slit experiment, the two slits are illuminated by light of wavelength and the angular distance between the fringes obtained on the screen is . If the whole apparatus is immersed in water then the angular fringe width will be, if the refractive index of water is .

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Solution:

Angular fringe width of pattern formed on the screen in Young's double slit experiment,
where, and are wavelength of light and slit width, respectively.

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