To day I have new subject it is about mirrors and lenses.

If light traviling in optecaly denser meduim and has an angle of incidence exceeding the Critical angle it experiences Total internal reflection, and no light emeges on the far side of the interface. Position the ray so that the angle of incidence is 2 degree less than the critical angle. What do you see happening to the transmitted ray?

I know that if the angle was more than critical angle, we can't see anything through
This meduim.
But less than 2 degree.

I think it will be unclear, and has colors.:eek:

It should refract in the normal way with a small amount of reflection depending on the material.

Any light going through any medium will split into colors, like you say. This is an inherent consequence of the fact that refractive index is dependent on light frequency.

Have a read of this:

Total internal reflection - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Critical_angle)