planoconvex

From plano- +‎ convex.

planoconvex (not comparable)

1. (optics, of a lens) Having one side plane and the other convex. [from 17th c.]
   • 1665, Robert Hooke, Micrographia:

     I place my Microscope, and then so place either a round Globe of Water, or a very deep clear plano convex Glass (whose convex side is turn'd towards the Window) that there is a great quantity of Rayes collected and thrown upon the Object […].

• convexoplane

• planoconcave