Assertion: lens | /r/HasAspect | focal point
Facets:
value: from the flat side
type: MANNER
Source sentences:
text: It has a focal point about 11 centimetres (4.5 in) from the flat side and a focal length of about 12 cm.
text: Since light can pass through a lens in either direction, a lens has two focal points – one on each side.