In Young's double slit experiment, number of fringes formed on a given length on the screen is 15. Now the whole experimental set-up is immersed in a liquid of refractive index 5/3. Then number of fringes formed on the same length on the screen is

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answer is B.

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Detailed Solution

Initially fringe width β=λDd∴Number of fringes formed, n=lβWhen immersed in liquid, β1=λ/μDd=βμ∴ Number of fringes formed, n1=lβ1=lβμ=μn∴ n1=53×15=25

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