OK, now I think I see what you're saying. It really depends on how deep the crater is.
The "right" side of the craters that you're seeing lit are the inner "walls" of the craters.
Get a bowl and a flashlight.
Place the flashlight about a foot from the bowl, pointing at it.
Turn on the flashlight and turn off all other lights.
Raise the flashlight straight up, always pointing at the bowl.
When you start, the inside of the bowl will be dark.
But, as the flashlight goes above the rim of the bowl, you'll see the light strike the opposite INNER side of the bowl, while the bottom remains in darkness.
That's what's happening in the above picture.