Revisions Log

A log of revisions to articles and news stories.

Jun 19 2025 - This updated version of our article on ultraviolet (UV) light provides a clearer and more comprehensive overview of the topic. We've reorganized the structure for better flow—starting with what UV light is, followed by its types, sources, measurement methods, uses, potential risks, and safety recommendations. New content includes an expanded section on Far UV-C, a simplified explanation of how UV light is measured, and a helpful video introducing the UV Index. We've also added more real-world applications, recent research studies, and updated safety tips.

Where Does Ultraviolet Light Come From and What Is It Used For?

Mar 11 2025 - The updated article retains the core explanations of mirror reflection but enhances clarity and readability. The focus has shifted from a heavily technical approach to a more structured and explanatory format, making concepts like specular vs. diffuse reflection and spherical aberration easier to understand. Additionally, terminology has been refined, with clearer explanations of virtual images, focal points, and optical axis behavior. While the core physics remains unchanged, the presentation is more accessible and engaging, making the content more useful for a broader audience.

How Does a Mirror Work?

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