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Len s Maker Formula is: A relation between the focal length of a lens (f), refractive index of the material of which lens is made and radii of curvature R<sub>1</sub> and R<sub>2</sub> of its surface. <img src="https://s0.wp.com/latex.php?latex=%5Cfrac%7B1%7D%7Bf%7D%3D%28n-1%29%5B%5Cfrac%7B1%7D%7BR_1%7D-%5Cfrac%7B1%7D%7BR_2%7D%5Damp;bg=ffffffamp;fg=000amp;s=4amp;c=20201002" alt="frac{1}{f}=(n-1)[frac{1}{R_1}-frac{1}{R_2}]">
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