1.

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

Answer»

`1.2`
`1.6`
`1.5`
`1.8`

Solution :Since apparatus of experiment is immerged in liquid hence WAVELENGTH will be `(1)/(mu)` th times and WIDTH of fringe also become `(1)/(mu)` th times.
The `10^(th)` bright fringe is found in the liquid,
`:.x=(10 lambda.D)/(d)""......(1)`
The `6^(th)` bright fringe is found in the liquied
`:. x=(2xx6-1)(lambda)/(2D)=(11lambdaD)/(2d) ""....(2)`
Equation (1) and (2) are equal
`:.(10 lambda.D)/(d)=(11lambda D)/(2d)`
`(20)/(11)=(lambda)/(lambda)`
`:. n=1.818`


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