How does the fringe width of interference fringes change, when the whole apparatus of Young's experiment is kept in a liquid of refractive index 1.3 ?

How does the fringe width of interfernce fringe change, when the whole apparatus of Young's experiment is kept in a liquid of refractive index 1.3?

How does the fringe of interference fringes change, when the whole apparatus Young's experiment is kept in water (refract index 4/3)?

In Young's double slit experiment the magnitude of the fringe width is beta . If the whole set-up of the experiment is immersed in a liquid of refractive index mu then the magnitude of the fringe width will be

How does the angular separation of interference fringes change in Young's experiment, if the distance between slits is increased .

What would be the effect on interference fringes in Young's double slit experiment if the experiment is conducted immersing whole set -up in a liquid of refractive index 1.3 ?