The Focal Length of a Glass Lens Depends on

The focal length of a glass lens depends on

A) the curvature of the surface of the lens.
B) the index of refraction of the glass.
C) the intensity of the light passing through the lens.
D) both the index of refraction of the glass and the intensity of the light passing through the lens.
E) both the curvature of the surface of the lens and the index of refraction of the glass.