Average Displacement = Timetaken Displacement ​ = 62.8 0 ​ =0 Average speed = Timetaken Distance ​ = T 2πr ​ = 62.8 (2π)(100) ​ = 10ms −1 %

When the speeds of light are equal in the two materials, rays of light are not bent when passing from one to the other, and transparent objects will nearly or completely disappear.

Light is a form of energy, while refraction some energy gets reflected while some gets refracted