A bi-convex lens is formed with two thin plano-convex lenses as shown in the figure. Refractive index of the first lens is and that of the second lens is . Both the curved surface are of the same radius of curvature . For this biconvex lens, for an object distance of , the image distance will be
The focal length of the lens with is given by
The focal length of the lens with is given by
The focal length of the combination is
Applying lens formula for the combination of lens
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