spherical lens n.
Abbr. sph A lens in which all refracting surfaces are spherical.
noun, Geometry. 1. a closed figure formed by arcs of great circles on a spherical surface. spherical polygon noun 1. a closed geometric figure formed on the surface of a sphere that is bounded by three or more arcs of great circles
noun 1. a method of navigation in which the curvature of the earth is taken into consideration.
noun, Geometry. 1. a triangle formed by arcs of great circles of a sphere. spherical triangle noun 1. a closed geometric figure formed on the surface of a sphere that is bounded by arcs of three great circles
noun 1. the branch of trigonometry that deals with spherical triangles. spherical trigonometry noun 1. the branch of trigonometry concerned with the measurement of the angles and sides of spherical triangles