Assertion: led's light | /r/CapableOf | escape for small angles of incidence
Facets:
value: relatively
type: DEGREE
value: due to the high refractive index
type: CAUSE
Source sentences:
text: A key challenge is total internal reflection at the surface of the semiconductor material: due to the high refractive index, light can escape only for relatively small angles of incidence, and even then there is substantial Fresnel reflection.