Young's double slite experiment is made in a liquid. The 10th bright fringe in liquid lies in screen where `6^(th)` dark fringes lies in vaccume. The refractive index of the liquid is approximately.

Explanation

`(10 lambdaD)/(d mu)=((2xx6xx -1)/(2))(lambda D)/(d)`
`implies (10 lambda)/(mu)(D/d)= (5.5)(lambda D)/(d)" or "mu= 1.8`.