The 180 degree rule

A visual image of the 180 degree rule

The 180 degree rule  is there to prevent  confusion for the views, this view is very important and should not be broken especially when filming a conversation. This rule means that the characters in the scene always have the same left or right to each other,  the rule is broken when the camera crosses the line this is called a reverse angle when this happens it causes a disruption to the scene and confusion to the viewers.