Physics

Lens Maker's Formula

लेंस निर्माता का सूत्र

In Class 12 Physics, under Chapter 9: Ray Optics and Optical Instruments, students learn how the Lens Maker’s Formula connects a lens’s focal length with its refractive index and the radii of curvature of its two surfaces. They study the relation 1/f = (μ − 1)(1/R₁ − 1/R₂) for a thin lens in air, apply the Cartesian sign convention, understand the assumptions behind the formula, and solve numerical problems involving converging and diverging lenses.