The light you see, (the brightness) is based on how much light is reflected back into your eye - the same way a magnifying glass works - from dim focus, to intense focus which you would burn something with. There is ALWAYS the same packet of light being reflected. Imagine the Sun, and a mirror. You face forwards but the mirror is angled away - therefore you are not in the direct path of the mirror and cannot see it. - (In a perfect world of course)
Light isn't reflected in a V, you have confused yourself. It doesn't come back in both directions. It enters on the left of the V and leaves on the right or vv.
