Answer:
The relation between the focal length \[f\], radii of curvature \[{{R}_{1}}\] and \[{{R}_{2}}\] of the two surfaces of the lens and refractive index \[\mu \] of the lens material is \[\frac{1}{f}=(\mu -1)\left[ \frac{1}{{{R}_{1}}}-\frac{1}{{{R}_{2}}} \right]\] This formula is called lens maker's formula because it is used by manufacturers to design lenses of required focal length from a glass of given refractive index.
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