Give one example each to indicate that the application of a force
A force that always tends to slow down the motion of an object on a surface is:
The following table gives the refractive indices of a few media : 12345Medium:WaterCrown glassRock saltRubyDiamondRefreactive index:1.331.521.541.712.42
Use this table to give an example of : (i) a medium pair so that light speeds up when it goes from one of these medium to another. (it) a medium pair so that light slows down when it goes from one of these medium to another.