Question

if a ray of light travels from medium A to medium B , bends towards the normal , then which among the two media can be called rarerr medium​

Answer 1

Explanation:

A ray of light moving from a rarer to a denser medium bends towards the normal whereas a ray entering a rarer medium from a denser medium bends away from the normal.

So, medium A is the rarer medium in this case.

Answer 2

Answer:

Refraction is the bending of light rays after entering a medium where its speed is different. Due to refraction of light, when a ray of light passes from a rarer medium to a denser medium, bends towards the normal to the boundary between the two media. The amount of bending depends on the indices of refraction of the two media. Hence, when a ray of light from air enters a denser medium, it bends towards the normal.