Focal length of convex lens P=25.0 cm
Pefractive index of glass μ=1.52
The focal length of the thin lens is defined as the image distance for an object at infinity or the object distance for an image at infinity.
Therefore, lens maker’s formula
f1=n1n2−n1(R11−R21)
For a convex lens R2 is flat so R21=0
f1=(μ−1)×R11μ=n1n2f1=(1.52−1)×R11R1=25.0×0.52=13cm
The radius of curvature is R1=13cm
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