Explain spectral absorptivity, reflectivity and transmissivity.

Spectral absorptivity, reflectivity, and transmissivity are fundamental concepts in the study of how materials interact with light, particularly in the context of electromagnetic radiation. These properties help describe how materials respond to incident light at different wavelengths or frequencies.

Spectral Absorptivity (α): Spectral absorptivity, often denoted as α (alpha), is a measure of ___ ____ ____ ________ ___ __________ _____ ___ _______ _____.
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