11. The complex reflectance ratio, \ rho, of the system is measured. 12. Assuring luminaire setback is greater than 90?from highly reflective surfaces also diminishes reflectance . 13. This reflectance then largely determines the perceived color. 14. Reflectance losses are a portion of quantum efficiency under " external quantum efficiency ".15. Deriving an inter-sensor consistent calibration for the AVHRR solar reflectance data record. 16. Directional-hemispherical reflectance is the integral of the BRDF over all viewing directions. 17. The Lambertian reflectance arises from the material's surface and immediate subsurface structure. 18. As the surface reflectance or optical thickness increase, the degree of polarization decreases. 19. :: The material used in the mirror is also important, see reflectance . 20. Clasts from beaches and streams tended to have reflectance values of less than 35 %.
