Assertion: microscope's distance | /r/HasProperty | positive
Facets:
value: always
type: DEGREE
value: in photography
type: LOCATION
Source sentences:
text: Therefore, in photography: Object height and distance are always real and positive.
text: Only if the focal length is negative, the image's height, distance and magnification are virtual and negative.
text: When the focal length is positive the image's height, distance and magnification are real and positive.