Question

Young's double slit experiment is first performed
in air and then in a liquid. It is observed that the
10th bright fringe in liquid is replaced by 8th dark
fringe in air. The refractive index of the liquid is?​

Answer 1

Answer:

Explanation:

Let $$β$$ be fringe width in air and $$β′$$ be fringe width in liquid.

Since 10th bright fringes in liquid coincide with 6 dark fringe in air.

$$10β′=5.5β$$

$$=μ\dfrac { β }{ β′ } $$

$$μ=\dfrac { 10 }{ 5.5 } $$

=1.8