Refraction: It is the phenomena of bending of light when it changes it medium. This can rarer to denser or denser to rarer. Refraction and Diffraction are just bending of light. Whereas, Reflection is getting back the light you've thrown from a source of light.
I am sorry but I don't know what the answer can be
Not trying to be mean plzz dont report me but I don’t see the question