optics
n.pl. (treated as sing.) Science of light and vision.
n. That branch of physical science which treats of the nature and properties of light, the laws of its modification by opaque and transparent bodies, and the phenomena of vision.
n.pl. (treated as sing.) Science of light and vision.
n. That branch of physical science which treats of the nature and properties of light, the laws of its modification by opaque and transparent bodies, and the phenomena of vision.