air and water

A thin prism of glass is placed in air and water respectively. If n_(0) = (3)/(2) and n_(w) = (4)/(3) , then the ratio of deviation produced by the prism for a small angle of incidence when placed in air and water separately is:

A thin prism of glass is placed in air and water respectively. If n(g)=3/2 and n_(w)=4/3 , then the ratio of deviation produced by the prism for a small angle of incidence when placed in air and water separately is

When light enters from air to water, then its

Brewster angle for air to water transition is (refractive index of water is 4/3 )

What is the special name of frictional exerted by fluids (like air or water) ?