a crystal thin enough to cause a phase difference of 90° between the ordinary and extraordinary rays of polarized light, thereby converting circularly polarized light into plane polarized light.
Why Are We Calling Everything A “Wave”?
Why have so many waves found their way into our cultural lexicon in recent years? In this article, the first in the column Mincing Metaphors, we unpack this oceanic metaphor to better understand what it means and why it’s proving so useful right now.
“UFOs?” What bizarre event spawned the phrase “flying saucer?”
There’s a fresh UFO hullabaloo, and that provides the perfect opportunity to encounter the origin of “flying saucer” and “UFO.” There are no alien autopsies, abductions or crop circles in these stories, but there is no shortage of weirdness. First, here’s the latest extraterrestrial extravaganza. A group of retired Air Force members and UFO researchers held a press conference claiming that aliens not only monitor, …
Compare half-wave plate.
Origin of quarter-wave plate
First recorded in 1880–85
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019