What wil be the effect on the fringes, if Young's double slit experiment set up is immersed in water ?

If entire Young's double-slit experiment set-up is immersed in water, then

What will be the effect on the fringes formed in Young's double slit experiment, if the apparatus is immersed in water,

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 ?