A lens is a transparent optical medium bounded by two surfaces; at least one of which should be spherical. Applying the formula of image formation by a single spherical surface successively at the two surfaces of a thin lens, a formula known as lens maker's formula and hence the basic lens formula can be obtained. The focal length (or power) of a lens depends on the radii of its surfaces and the refractive index of its material with respect to the surrounding medium. The refractive index of a material depends on the wavelength of light used. Combination of lenses helps us to obtain diverging or converging lenses of desired power and magnification.

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CASE_STUDIESPower of a LensLens Maker's FormulaCombination of Thin Lenses in ContactLens Formula and Magnification with Sign ConventionDerivation of Lens Formula from Refraction at Spherical SurfacesCBSE PYQ4 sub-questions

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