Absorptance

Absorptance is the ratio of the absorbed and the incident radiation at a particular wavelength

Introduction

Incident EM radiation (I) is partially absorbed (A) by the matter. The ratio

%5Calpha(%5Clambda)%3D%5Cfrac%7BA(%5Clambda)%7D%7BI(%5Clambda)%7D
Equation 1

is absorptance of the object, it depends on wavelength λ and ranges from 0 to 1. It is a property of material and does not depend on I.

Incoming relations