why does light refract in whater. does it relfect light?

Answer 1

Water does both reflects as well as refracts light.

The refraction is caused by the change in speed of light in a particular medium.

Answer 2

Light refracts when it enters water because water is a transparent medium with a different index of refraction than air. The diffraction angle is determined by Snell's Law (link). Some light is refected too, with an angle of incidence equal to the angle of reflection.

A proper explanation for these effects is found in the solution to the boundary value problem of an electromagnetic wave at the discontinuity. It entails the continuity of normal magnetic field and the transverse electric field, as implied by Maxwell's equations.

Answer 3

Almost all of the time when light changes mediums, it changes direction by refracting/bending.
However, if it strikes the interface of the two mediums with an angle of incidence of 0 degrees, then no bending will occur.
Also, there are some conditions where light travels from one medium into another and does not bend for any angle of incidence. This happens when the two mediums are different substances, but have the same optical density.
Light is partially reflected on water. Otherwise you would not see any reflection on the surface.

Answer 4

Water does not reflect light, on the contrary it passes through just like air, because light becomes distorted through water no longer making a straight path.