https://www.khanacademy.org/science/ap-physics-2/x0e2f5a2c:geometric-optics/x0e2f5a2c:mirror-formula-and-magnification/v/sign-conventions-for-mirror-lenses 2020-12-16T15:49:06Z Sign convention for mirrors (& lenses) Let's explore the sign conventions (rules to assign +ve and -ve values) we use for mirrors and lenses. These rules are called Cartesian sign conventions. Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/fsOjTc9-iwrQGTDfriaC6xdV8myBID9W5NAG7Q-twQpefDpBv1SnLQPcrGbufzrQ-Z5WA17LwzSw5JwEIr2RL9E Sign convention for mirrors (& lenses) Let's explore the sign conventions (rules to assign +ve and -ve values) we use for mirrors and lenses. These rules are called Cartesian sign conventions. https://cdn.kastatic.org/ka-youtube-converted/Mc--Yz_YrsU.mp4/Mc--Yz_YrsU.mp4 610 Mirror Formula https://www.khanacademy.org/science/ap-physics-2/x0e2f5a2c:geometric-optics/x0e2f5a2c:mirror-formula-and-magnification/e/sign-conventions 2026-04-07T23:55:07.30621384Z Sign convention Let's practice problems involving the Cartesian sign convention for mirrors and lenses. Satrajit exercise https://www.khanacademy.org/science/in-in-class10th-physics/in-in-10th-physics-light-reflection-refraction/in-in-mirror-formula-derivation-bonus/v/mirror-formula-derivation-class-12-india-physics-khan-academy 2020-12-08T16:00:16Z Mirror formula derivation In this video, we will derive the mirror formula (expression connecting u,v, and f) and magnification formula. We will use a concave mirror to do it. Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/jcuE2wtco5sG3k2IVmh4sQhirMkGDJMu98w20elbMjtDLMfIVRLyBLwL4tqQXCHyUhIpjvIFLxuVmSrrk_ukrFY Mirror formula derivation In this video, we will derive the mirror formula (expression connecting u,v, and f) and magnification formula. We will use a concave mirror to do it. https://cdn.kastatic.org/ka-youtube-converted/PgQJCm_sXVY.mp4/PgQJCm_sXVY.mp4 577 Mirror Formula https://www.khanacademy.org/science/ap-physics-2/x0e2f5a2c:geometric-optics/x0e2f5a2c:mirror-formula-and-magnification/v/mirror-formula 2020-06-23T07:22:43Z Mirror formula Let's explore the mirror formula (1/f = 1/v+1/u) and see how to locate images without drawing any ray diagrams. Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/9_sZFtNMVSfDEPpHM6eQnlvhZ3b2kKayTwsXi6P-u6EwwN57M6nKXDU6xG1W51QhBUcGJypOGyAjbP8c_BdwzfBP Mirror formula Let's explore the mirror formula (1/f = 1/v+1/u) and see how to locate images without drawing any ray diagrams. https://cdn.kastatic.org/ka-youtube-converted/EPlr16b4XnQ.mp4/EPlr16b4XnQ.mp4 533 Mirror Formula https://www.khanacademy.org/science/ap-physics-2/x0e2f5a2c:geometric-optics/x0e2f5a2c:mirror-formula-and-magnification/e/using-mirror-formula 2026-04-08T00:36:09.500768563Z Using the mirror formula Let's practice calculating distances in optical measurements with spherical mirrors using the mirror formula. Satrajit exercise https://www.khanacademy.org/science/ap-physics-2/x0e2f5a2c:geometric-optics/x0e2f5a2c:mirror-formula-and-magnification/v/magnification-formula-for-mirrors 2020-06-23T07:22:42Z Magnification formula for mirrors Let's explore how to calculate image height and it's nature (real or virtual) using magnification formula. Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/89PoSYDrsKTdfC5Q64ddxQdMUCTAhqOIrV5FHVw-OEomchlHdhXG25326V4TS8dn-YkSOGWFjXQ5QKgh4FtG0Dw Magnification formula for mirrors Let's explore how to calculate image height and it's nature (real or virtual) using magnification formula. https://cdn.kastatic.org/ka-youtube-converted/FfvuY8xsO1Y.mp4/FfvuY8xsO1Y.mp4 613 Mirror Formula https://www.khanacademy.org/science/ap-physics-2/x0e2f5a2c:geometric-optics/x0e2f5a2c:mirror-formula-and-magnification/e/using-the-magnification-formula 2026-04-08T00:36:09.500768563Z Using the magnification formula for mirrors Let's practice problems involving the magnification formula for mirrors. Satrajit exercise https://www.khanacademy.org/science/ap-physics-2/x0e2f5a2c:geometric-optics/x0e2f5a2c:mirror-formula-and-magnification/e/nature-of-image-given-magnification 2021-04-29T07:48:49Z Nature and size of images from magnification Let's practice finding out the nature and size of an image given the magnification produced by the mirror. Satrajit exercise https://www.khanacademy.org/science/in-in-class10th-physics/in-in-10th-physics-light-reflection-refraction/in-in-mirror-formula-magnification/v/solved-example-mirror-formula 2020-12-08T16:00:17Z Solved example: Mirror formula We will find the properties of the image formed by a convex mirror. We will do that using the mirror formula and apply sign conventions. Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/VOwD95bUJnEJqknBwuJO3T37bQ6QtxYmEB6wufL8RRQIYkuHe8XYGA1Loylaw_i2Xpo_xITJ5IuqlLnumQmTV8WVtA Solved example: Mirror formula We will find the properties of the image formed by a convex mirror. We will do that using the mirror formula and apply sign conventions. https://cdn.kastatic.org/ka-youtube-converted/modYmQyA9zo.mp4/modYmQyA9zo.mp4 499 Mirror Formula https://www.khanacademy.org/science/ap-physics-2/x0e2f5a2c:geometric-optics/x0e2f5a2c:mirror-formula-and-magnification/e/concave-and-convex-mirrors 2026-02-28T16:20:46.436623441Z Concave and convex mirrors Let's practice word problems involving spherical mirrors using the mirror and the magnification formulas together. Satrajit exercise