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ConceptLensmaker's Formula

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#### Question

A point object 'O' is kept in a medium of refractive index *n*_{1} in front of a convex spherical surface of radius of curvature *R* which separates the second medium of refractive index *n*_{2} from the first one, as shown in the figure

Draw the ray diagram showing the image formation and deduce the relationship between the object distance and the image distance in terms of *n*_{1}, *n*_{2} and *R*.

When the image formed above acts as a virtual object for a concave spherical surface separatig the medium *n*_{2} from *n*_{1} (*n*_{2} > *n*_{1}), draw this ray diagram and write the similar (similar to (a)) relation. Hence obtain the expression for the lens maker's formula.

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