They are reflected at the angle of incidence.
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they are reflected at an equal opposing angle on a first-surface mirror. on a second surface (bathroom mirror) they are also reflected, but some are absorbed/disbursed by impurities and inconsistencies in the glass.
The light from the sun travels in a straight line, and we can assume the light rays to be parellel. The angle of incidence on the earths rounded surface depends on where you are on the earth and what time it is. Mid-day on the equator and the rays would hit the ground straight on. Further to the north or south, or later/earlier in the day and the light rays would hit at more of angle. The rays would also have to penitrate more of the earths atmosphere as the angle increases, which takes more `strength` out of the sun.
The angle does not hit anything! A ray of light hits a mirror or glass block and the angle that the ray makes with the vertical at the point of contact is the angle of incidence.
Light travels in straight lines and therefore some will hit the tree. Where this happens a shadow (absence of light) is created behind the tree.
Probably nothing but if the kite happens to hit an are of the wire which is unprotected you may get a shock.