>> OK, I see now, I don't really see a nude Bettie Page, just the reflection of light. <<That would be true only if she were there before you.
In your example to us above, there most likely is/was no Betty Page at all (unless she was there and you took that pic).
All we see is the light emitted and reflected back at our eyes from her digital image on a monitor.
Light travels at a given rate, and the various functions of the human brain and nervous system react at a given rate. We can't see through or across space and time. We have to wait for the reflected light to reach our eyes for it to set off a chain of events in our eyes and in our minds that will present us with a highly processed mental image of what once was.
Time and distance, be they great or small, and the realities of our human vision systems and are always a factor.
Due to that lag, we are always seeing what was, and not what is.
Below is an excellent article on exactly how and why we see what we see
"The Human Vision System" with discussion on the properties of "Light"
http://www.wayfinding.net/vsionsys.htm
"Vision requires reflected light.
There is no information in direct light from the sun, a lamp, or any other light source.
In a science experiment called Project Eureka, author and scientist Arthur Zajonc constructed a box into which a powerful projector shown.
The experimenter took special care that no reflected light was seen from objects or surfaces within the box.
When viewers looked inside the box, they saw only pure light.
When viewed from the front (so the projector could not be seen) the observer sees nothing, there is absolute darkness.
If light is not shown directly into an eye, or is not reflected from a surface, it is invisible".