When the paperboard tilts, does the incoming light not attach the cardboard to the mirror?
First of all, the cardboard is the vertical surface of the table, the vertical light to the cardboard appeared a light, indicating that at this time is affixed to the paper, that is, the incident light is affixed to the cardboard mirror
There is an infinite line across a line, just like the surface spun out of an axis. A plane is made up of numerous straight lines. The two rays reflected must be coplanar, but not necessarily on the cardboard. For example, the cardboard is rotated slightly and a straight line is missing
The reflected light is the line on the right that is reflected in the mirror, so it must be in the same plane as the incident light, that is, the reflected light is in the same plane as the incident light. These two statements are not contradictoryIn addition, the incident light is not perpendicular to the surface of the paper and reflects light
