adjective
- having one flat surface and one concave (inward-curving) surface, especially of a lens
Usage: technical; optics
Examples
- A planoconcave lens has a flat side and a curved inward side.
- The optical system uses a planoconcave mirror to focus light.
- Planoconcave lenses are commonly used in eyeglasses for certain prescriptions.
- The planoconcave surface of the lens diverges incoming light rays.
- Engineers selected a planoconcave design to reduce spherical aberration.