What is Reflectance?

What is Reflectance?

Reflectance Definition

Reflectance is defined as the ratio of the radiant flux reflected from a surface to the incident radiant flux, and it is unitless.

Types of Reflectance

• Specular (mirror-like)

• Diffuse (scattering)

Reflectivity Definition

Reflectivity is the property of a material to reflect light or radiation and remains consistent regardless of the material’s thickness.

Reflectance Measurement

Reflectance can be measured relatively using a reference plate or absolutely by comparing to the light source.

Solar Reflectance Index

This index indicates a material’s ability to reflect solar energy, ranging from 0 to 1.