Stray light reaches a photodetector by an unintended path or from outside the intended wavelength band. It can bias spectrophotometry by adding received radiant power.
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Stray light refers to unwanted or unintentional light that enters an optical system, such as a camera, telescope, or microscope, and can interfere with the proper functioning or quality of the system. This stray light can come from various sources, such as reflections, scattering, or light leakage, and can degrade image quality by causing issues such as reduced contrast, decreased sharpness, and unwanted artifacts.