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Q.

Young's double-slit experiment is made in a liquid. The 10th bright fringe in liquid lies where 6th dark fringe lies in vacuum. The refractive index of the liquid is approximately

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a

1.8

b

1.54

c

1.67

d

1.2

answer is A.

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Detailed Solution

In liquid wavelength reduces by a factor equal to refractive index of liquidPath difference is equal for bright and dark condition10×λμ=(2×6-1)λ2⇒μ=1.81
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