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Starting new cartesian sign conventions, derive the relation. `-frac(mu_1)(u)`+`frac(mu_2)(v)`=`frac(mu_2-mu_1)(R)`, when refraction occurs from rarer to denser medium at convex spherical refracting surface `(mu_1 lt mu_2)`. Where u, v and R are object distance, image distance and radius of curvature of spherical surface respectively.

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