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Derive the lens maker formula in case of double convex lens 3 marks

Answer»

Step-by-step Explanation:Consider FIGURE with the two refracting surfaces having radii of CURVATURE equal to and , respectively. Now, using the result that we OBTAINED for REFRACTION at single spherical surface, we getFor the first surface, For the second surface, Adding Eqs. (1) and (2), we getIn the above equation, if the object is at infinity and image is formed at the focus, then Therefore,



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