During refraction, waves bend when they pass from one medium to another. the waves refract because their changes. a) appearance b) intensity c) size d) speed

Speed

Explanation:

When waves travel in different mediums then due to change in the speed of the wave the path of the wave will change.

Initially wave is travelling in the given direction with some speed "v"

now when the medium of the wave will change then it will change the speed as we know that

now due to this change in the refractive index of the speed and hence the wavelength will change in different mediums

So here correct answer will be

D) Speed

because growing process had stoped after 4-5 year