WHAT DO U MEAN BY REFRACTION AND WHATS THE DIFFERENCE BETWEEN REFLECTION AND REFRACTION
Refraction of light refers to the bending of the path of light as it passes from one medium to another. This happens because the speed of light changes as the medium it travels through varies. The medium cases the light to either speed up or slow down depending upon its index and this results in the bending of light.
Consider the figure below
Here the light ray bends towards the normal as it slows down after entering the medium. If it speeds up then it will bend away from the normal.
Reflection and refraction Differences:
Reflection has no change in medium whereas refraction always has change in medium.
There is no bending of light in the case of reflection, the light bends in refraction.
There is no change in velocities of light in the case of reflection, the velocity of light changes in refraction.