(physics) The angle of incidence beyond which light traveling through a medium experiences total internal reflection upon encountering a boundary with a less refractive medium.

(chemistry) In a chain of atoms A-B-C-D, the dihedral angle between the plane containing the atoms A,B,C and that containing B,C,D

plural of critical angle

plural of angle bracket

plural of spherical angle

plural of oblique angle

plural of canted angle

(geometry) A particular dihedral angle, the angle between two intersecting arcs on a sphere, measured by the angle between the planes containing the arcs.

plural of Dutch angle

(optics) The angle between the perpendicular and a ray reflected from a surface