How Lenses Are Made (Optical Design & Formulas)
Modern lenses are not just shaped pieces of glass—they are the result of complex optical calculations designed to precisely control how light propagates through materials. 1. Refraction and Snell’s Law At the core of lens design is refraction, described by Snell’s Law : This equation governs how light bends when passing between materials with different refractive indices. Lens designers select glass types based on their refractive index (n) and dispersion (Abbe number). 2. Lens Maker’s Formula The shape of a … Read More









