https://www.khanacademy.org/science/in-in-class-12th-physics-india/in-in-ray-optics-and-optical-instruments/in-in-refraction-in-thin-lenses/v/lens-makers-formula 2020-06-23T07:22:42Z Lens makers formula Let's derive the famous lens makers formula. This formula only works for thin lenses. Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/Zjwbgmp3s6CUqovtmCng2CT-tfPfMath9o_xyj_E812C_6KAt2MzbfGUEiGAADGiG7UYfBvIam1-LeXeURSGSwGy Lens makers formula Let's derive the famous lens makers formula. This formula only works for thin lenses. https://cdn.kastatic.org/ka-youtube-converted/fQLIyeoM5uw.mp4/fQLIyeoM5uw.mp4 846 Lens maker’s formula https://www.khanacademy.org/science/in-in-class-12th-physics-india/in-in-ray-optics-and-optical-instruments/in-in-refraction-in-thin-lenses/v/solved-example-lens-makers-formula 2020-06-23T07:22:41Z Solved example: Lens makers formula Can a convex lens diverge a beam of light? Let's do some problem-solving and figure out the focal length of the convex lens when it's kept in air and oil. Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/qZma-ufIFDqxaR-HuS-6-QZGNb578OXmHnX1QTHprNL3bU_ZzE2mPeYTa7ql_Ae4GJTtJzFyLiTE-eYU0EbAt8I1 Solved example: Lens makers formula Can a convex lens diverge a beam of light? Let's do some problem-solving and figure out the focal length of the convex lens when it's kept in air and oil. https://cdn.kastatic.org/ka-youtube-converted/qCZc9U9XQWk.mp4/qCZc9U9XQWk.mp4 636 Lens maker’s formula https://www.khanacademy.org/science/in-in-class-12th-physics-india/in-in-ray-optics-and-optical-instruments/in-in-refraction-in-thin-lenses/e/sign-convention-radii-of-curvature-lens-maker-s-formula 2026-04-07T23:36:17.218592739Z Sign convention: radii of curvature (lens maker's formula) Let's solve some problems to better understand the sign convention of the radii of curvature in the lens maker's formula. Aakash exercise