State using a neat diagram, what happens to the path of light when..

Q] State using a neat diagram, what happens to the path of light
i. when light ray passes from rarer to denser medium.
ii. when light ray passes from denser to rarer medium.
iii. when light ray is incident normally at the boundary between two media.

Answer:

i. When a light ray passes from a rarer medium to a denser medium, it bends toward the normal.

ii. When a light ray passes from a denser medium to a rarer medium, it bends away from the normal.

iii. When a light ray is incident normally at the boundary between two media i.e., i = 0, it does not change its direction and hence does not get refracted. i.e., r = 0