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Lens Formula #8211; focal length of the lens is given by, 1/f = (μ<sub>2</sub>/ μ<sub>1</sub> #8211; 1) (1/ R<sub>1</sub> #8211; 1/ R<sub>2</sub>) where, R<sub>1</sub> and R<sub>2</sub> are the radii of curvature of first and second refracting surfaces of a thin lens, f is the focal length and μ is refractive index of material of lens with respect to surrounding medium as shown in the figure given below. If μ<sub>2</sub> and μ<sub>1</sub> = 1, then ⇒ [1/f = (μ #8211; 1) (1/R<sub>1</sub> #8211; 1/R<sub>2</sub>)] This is called lens maker Formula. Lens maker formula is used to design lenses of desired focal length. Lens formula is given by 1/v #8211; 1/u = 1/f
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