Light

Do we see things because light bounces off them?
That seems to be the prevailing wisdom.
Another nugget of wisdom is that light moves at a constant velocity, known as C.
Now, if light bounces off something, does that slow light down?
Does light not suffer any diminution of energy in being reflected and interacting with another surface?
If light is a form of radiation, why doesn't it just go through objects instead of reflecting off them?
If light is affected by gravity, as it has been shown to be, why does light traveling away from the sun not move at a slower pace than light headed for the sun?
Why, in outer space, is anything limited to any certain speed. Any speed seems possible.
Why is glass transparent and sand, of which glass is made, is not?
As light penetrates layer after layer of glass, does it slow down and finally stop?\3w