An optical element is constructed using a plano-convex lens made of glass with an index of refraction \(n > 1\) and a curved surface with radius of curvature \(R\). Two silvering configurations are prepared:

• System 1: The flat back surface of the lens is silvered, so incoming parallel light rays refract at the curved front surface, reflect off the flat back surface, and refract again upon exiting the curved surface.
• System 2: The outer curved front surface of the lens is silvered, so incoming parallel light rays strike the silvered curved surface directly.

Which of the following correctly indicates whether the focal length of each system depends on the index of refraction \(n\) of the glass?