the branch of optics dealing with light as rays, especially in the study of the effects of lenses and mirrors on light beams and of their combination in optical instruments.
How Tetris Got Its NameFor over two decades, the puzzle video game Tetris has provided countless hours of procrastination and enjoyment for players all over the globe. But now, researchers believe that Tetris might have a new purpose. They think that the game may help to prevent the flashbacks that occur in the early stages of post-traumatic stress disorder. While the research is fascinating, let’s turn our attention to …
What Happens When Memes Go WrongLOLcats. Good Guy Greg. Forever Alone Rage Face. Scumbag Steve. If you recognize that these are internet memes, you’re not oblivious to the raging cultural phenomenon that has swept internet screens in the last several years. So, what does meme mean? For the uninitiated, an internet meme is any concept expressed through digital media that goes viral—a photo, video, GIF, song, doodle, fictional character, symbol. The …
Origin of geometrical optics
First recorded in 1830–40
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019