https://academic.bancey.com/categories/optics/ Recent content in Optics on Dr. Simon Bance Hugo en Sun, 26 Jul 2026 00:00:00 +0000 https://academic.bancey.com/posts/deriving-snells-law-fermat-principle-substitution/ Sun, 26 Jul 2026 00:00:00 +0000 https://academic.bancey.com/posts/deriving-snells-law-fermat-principle-substitution/ Snell’s Law is often introduced as a formula to memorize. In reality, it captures a deep physical principle about how light chooses its path when moving between materials.