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A point object 'O' on the principal axis...

A point object 'O' on the principal axis of a spherical surface of radius of curvature 'R' separating two media of refractive indices `n_(1) and n_(2)` forms an image 'I' as shown in the figure below. Prove that `(n_(2))/(v)-(n_(1))/(v)=(n_(2)-n_(1))/(R)`

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