Assertion: lens's aperture | /r/CapableOf | block light
Facets:
value: from the edges of a lens
type: TRANSITIVE-OBJECT
Source sentences:
text: Those apertures are small enough to block light from the edges of a lens, but they aren’t so small that diffraction is a significant problem.
text: A smaller aperture actually blocks light that has traveled through the edges of a lens, which improves the sharpness of a photograph.