# Resolve RDF Terms

quantitykind:Refectance
http://qudt.org/vocab/quantitykind/Refectance

### Recommended prefix

quantitykind:

lang:en
Refectance
lang:""
$$\rho = \frac{\Phi_t}{\Phi_m}$$, where $$\Phi_t$$ is the reflected radiant flux or the reflected luminous flux, and $$\Phi_m$$ is the radiant flux or luminous flux of the incident radiation.
lang:""
$$\rho$$
lang:""
Refectance and reflectivity generally refer to the fraction of incident electromagnetic power that is reflected at an interface, while the term "reflection coefficient" is used for the fraction of electric field reflected. Reflectance is always a positive real number.