A translucent dust cap for a fiber optic adapter allows the viewing of visible light emanating from a fiber optic connector coupled to the adapter, without removing the dust cap. A translucent dust cap for a fiber optic adapter that serves to diffuse a visible light source of sufficient power, such as that from a VFL, and lights up to aid in connector identification. A translucent dust cap for a fiber optic adapter that serves to attenuate infrared optical transmission power to prevent eye damage.