Instead of a concave lens near the eye ... Other scientists had speculated that using mirrors rather than lenses might correct this problem, but Newton was the first to put such thoughts into ...

One of my pet peeves with some compact cameras is that they often skip the viewfinder entirely. But one photographer and ...

A concave lens is used to diverge or spread out light rays. (d) Between the pole of the mirror and its principal focus. Answer: (d) Between the pole of the mirror and its principal focus.