Question

a ray of light incident normally on air water interface moves​

Answer 1

Ray will pass through Normal.

According to snell's law

μ1 sini = μ2 sinr

when rays is perpendicular to surface and incidence angle is

i=0

So , μ1 sin0 = μ2 sinr

sinr=0

r=0

, So ray will pass without deviation.