Question

How does a ray of light bend when it travels from a denser to rarer medium and rarer to a denser medium

Answer 1

this is because of refraction.

Answer 2

HEY MATE,
Here is your answer
__________________________

• Bending of light happens due to $\bf{Refraction}$.

• When a ray of light travels from an optically denser medium to rarer it bends $\bf{away\:from\:the\:normal}$

• When a ray of light travels from an optically rare medium to denser medium it bends $\bf{towards\:the\:normal}$
__________________________

Hope this helps!!!!