Which mounting type involves a metal reinforcing arm connecting the centerpiece with the endpiece?

The option indicating semi-rimless mounting is the correct choice because this design typically features a metal wire or arm that provides structural support between the centerpiece of the frame, where the lenses are held, and the endpieces that connect to the temple ends. This type of mounting highlights a partial rim that secures the lens at the bottom while allowing an unobstructed view at the top section, which enhances aesthetics and lightness.

The reinforcement through the metal arm is critical as it offers stability to the lenses while keeping the design sleek and minimal. This unique construction makes semi-rimless mounting popular for those seeking both functionality and style in eyewear.

In contrast, other mounting types, such as rimless or Numont, may not utilize the same structural arrangement, focusing instead on different aesthetic elements or more extensive rimmed designs. Rimless mounting generally does not have any frame around the lens edges, while Numont mounting is characterized by a distinctive style without additional arm support like that found in semi-rimless designs. Bridge mounting refers to the component of glasses that connects the two lenses across the nose but doesn’t describe a specific design of lens mounting.