Assertion: lens's element | /r/HasProperty | lens
Facets:
Source sentences:
text: Elements are curved pieces of glass much like the lenses commonly found in ordinary magnifying glasses or in eyeglasses.
text: These elements can be both lenses and mirrors, but since multiple surfaces are involved, achieving good aberration correction in these systems can be very complex.
text: Elements which refract electromagnetic radiation outside the visual spectrum are also called lenses.