catoptrics

Noun

 * 1) The branch of optics dealing with reflection.
 * , I.iii.3:
 * 'tis ordinary to see strange uncouth sights by catoptrics; who knows not that if in a dark room the light be admitted at one only little hole, and a paper or glass put upon it, the sun shining will represent on the opposite wall all such objects as are illuminated by his rays?