Physical meaning of reflection

Hello all,
I was wondering about the physical meaning of reflection for quite a while. Suppose say I have a transmission line and say it has reflection at discontinuity what does this mean in physical sense. It would be really helpful if I get answers for this.

I have couple of other question too.
1. Rayleigh scattering - This is the phenomeno we use to explain the blueness of sky, but isnt violet lesser in bandwidth compared to blue in visible spectrum and shouldnt that be scattered more and the sky should look violet?


Regards
KoussalyaBalu
 

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