9.3.6 Sign Convention for Spherical Lenses
Chapter 9: Light – Reflection and Refraction · SCIENCE · EN medium
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. . Sign Convention for Spherical Lenses For lenses, we follow sign convention, similar to the one used for spherical mirrors. We apply the rules for signs of distances, except that all measurements are taken from the optical centre of the lens. According to the convention, the focal length of a convex lens is positive and that of a concave lens is negative. You must take care to apply appropriate signs for the values of u , v , f , object height h and image height h ′ .
📖 ncert books class 10 science chapter 9 · Page 22
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. . Sign Convention for Spherical Lenses For lenses, we follow sign convention, similar to the one used for spherical mirrors. We apply the rules for signs of distances, except that all measurements are taken from the optical centre of the lens.
According to the convention, the focal length of a convex lens is positive and that of a concave lens is negative. You must take care to apply appropriate signs for the values of u , v , f , object height h and image height h ′ .
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