What effect does light have on white paper: does it reflect or transmit?
If the paper is a perfect white, then it would reflect 100% of the light incident on it and would reflect that light mostly in a diffuse (scattered in different directions) way. Real paper is not perfect and typically reflects something like 80% to 90% of the light that falls on it. The rest of the light is either absorbed or transmitted. If you can see light through the paper (i.e., it is not completely opaque), then you know it is transmitting some light.
