1626
: the angle that a line (as a ray of light) falling on a surface or interface makes with the normal drawn at the point of incidence
1626
: the angle that a line (as a ray of light) falling on a surface or interface makes with the normal drawn at the point of incidence
Merriam Webster Collegiate English Dictionary. Merriam Webster - Энциклопедический словарь английского языка. 2012