Q. What is happening on a car’s rearview mirror when you flip the little lever for night driving to reduce glare from cars behind you? P.H., Gurnee A. You are talking about the mechanically operated ...

The incandescent light bulb was one of the first early applications of electricity, and it’s hard to underestimate its importance. But before the electric light, people didn’t live in darkness — they ...

Rotate and reverse images and deflect light at 90° bends. Suitable for telescopes and any optical instrument that requires the image to be flipped from the objective, turned over to the right, and ...

Right angle prisms are simply triangular blocks of glass with two 45° & one 90° angles. The precision grade right angle prisms have high surface quality and tight tolerance angles. The normal use for ...