reflection

https://doi.org/10.1351/goldbook.08281

Process by which electromagnetic radiation is reflected by a sample. For non-scattering samples the term means Fresnel reflection; for scattering samples the term includes regular reflection and volume reflection or diffuse reflection.

Source:
PAC, 2021, 93, 647. 'Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)' on page 671 (https://doi.org/10.1515/pac-2019-0203)