blue light physics Actions Share Share Share to social media Facebook X URL https://www.britannica.com/science/blue-light Share Share Share to social media Facebook X URL https://www.britannica.com/science/blue-light Written by Michael McDonough Michael McDonough was a media team intern at Encyclopaedia Britannica. He is expected to graduate in 2023 from Northwestern University. Michael McDonough Fact-checked by The Editors of Encyclopaedia Britannica Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree. They write new content and verify and edit content received from contributors. The Editors of Encyclopaedia Britannica Last Updated: Jun 21, 2024 • Article History Table of Contents blue light, Blue light is a category of visible light with a wavelength roughly between 380 and 500 nanometers (nm). Blue light is perceived as the color blue, though it may also be present in light perceived as another color, particularly white light. Blue light can be divided into two subcategories: high-energy blue-violet light (generally between 380 and 450 nm) and blue-turquoise light (generally between 450 and 500 nm). Blue light plays a role in maintaining circadian rhythm and mood. As the presence of blue light-emitting screens and LEDs (light-emitting diodes) has grown, especially since the COVID-19 pandemic, there have ...(100 of 717 words)

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