Question

Why does the refracted ray bend away from normal on travelling from denser to rarer medium?

Answer 1

$\huge\mathfrak\red{Heya\:..!}$

the angle of refraction (r) is greater than the angle of incidence (i). Also, water is an optically denser than air, so when a beam of light enters into air, it bends away from the normal. When a ray of light goes from a rarer medium to a denser medium, its speed decreases or it slows down.