What is "catoptrics"

Anacamptics \An`a*camp"tics\, n.

1. The science of reflected light, now called catoptrics.

2. The science of reflected sounds. [1913 Webster] ||

n. (plural of catoptric English)

n. branch of optics dealing with formation of images by mirrors

Catoptrics (from katoptrikós, "specular", from katoptron "mirror") deals with the phenomena of reflected light and image-forming optical systems using mirrors. A catoptric system is also called a catopter (catoptre).