Draw a ray diagram showing the path of rays of light when it enters with oblique incidence (i) from air into water , (ii) from water into air.

Explanation

(i) When ray of light enters with oblique incidence from air into water, then it goes from optical rarer medium to optical denser medium and velocity of light decreases which in turn bends the incident light towards the normal. Also, i gt r

(ii) When ray of light enters with oblique incidence from water into air, then it goes from optical denser medium to optical rarer medium and volocity of light increases which in turn bends the incident light away from the normal. Also, i lt r.