Lensmakers equation

The Lensmaker's equation relates the shape and curvature of a lens to its ability to focus light. It describes how the lens' focal length—the distance from the lens where light converges—is influenced by the lens's radii of curvature (the curvature of its surfaces) and its refractive index (how much the lens material bends light). By using this equation, opticians can design lenses for glasses, cameras, and other optical devices to achieve the desired focus and clarity, ensuring that light is directed accurately to create sharp images.