Assertion: ordinary glass | /r/HasAspect | refractive index of n = 1.5
Facets:
Source sentences:
text: Ordinary glass has a refractive index of n = 1.5, while the addition of lead produces a range up to 1.7 or 1.8.
text: Ordinary glass has a refractive index of n = 1.5; the addition of lead produces an index of refraction of up to 1.7.