What is the maximum range of visibility using a signaling mirror?

The maximum range of visibility using a signaling mirror can indeed reach up to 40 miles under optimal conditions. This distance is largely influenced by a combination of factors such as the size and quality of the mirror, the angle of sunlight, atmospheric conditions, and the observer’s eyesight. Signaling mirrors, especially those designed for emergency situations, are crafted with specific characteristics to enhance reflectivity and focus the light beam effectively to attract attention from a distance.

A properly used signaling mirror can enable a person to reflect sunlight into the eyes of observers who may be quite far away, which is essential for rescue scenarios. The 40-mile maximum range reflects the best-case scenario where all conditions align favorably. In contrast, the other options suggest ranges that exceed the capabilities of typical signaling mirrors, as they do not take into account the inherent limitations of the signaling technology and the environmental variables that affect visibility.