A box contains two lenses made of the same glass material. Lens A is a bi-convex lens has front and back radii of curvature of |RA| = 30.0 cm, and labeled with a focal length of fA = 25.0 cm. The second lens is a planoconvex lens with one flat surface (R = [infinity] ) and the other surface having a radius of curvature that matches the other lens ( |RB| = 30.0 cm ). What is the focal length of len