The branch of physics that deals with light and vision, chiefly the generation, propagation, and detection of electromagnetic radiation having wavelengths greater than x-rays and shorter than microwaves.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "optics" in a sentence
"Also today's rifled slug gun with modern optics is a long way from Uncle Bud's High Standard pump."
"Even in optics where you usually get what you pay for there are binos etc. that I just can't imagine are worth the price."
"Su, F. (1990) Technology of our times: people and innovation in optics and optoelectronics."