I don't know why, but I always think of an Alfred Hitchcock movie when I think about the phrase rear view mirror.
Rear Window is a suspenseful movie. Ideally, looking back through your rear window while driving shouldn't be. Suspenseful, that is!
Typically, the factory installed interior rear view mirror is eight inches long. By swapping out your car's rear view mirror for one that is longer, you can improve your visibility ability.
On my To-Do List: A visit to my local auto parts store or an auto wrecker's for a replacement mirror.