The Light List shows that a navigational light has a nominal range of 19 miles and a height above water of 52 feet (15.8 meters). Your height of eye is 42 feet (12.8 meters) and the visibility is 10.0 miles. At what approximate range will you first sight the light?

Correct Answer: Option B — 16.0 miles

Luminous range is the limiting factor here. While the geographic range (distance to horizon) is approximately 15.5 miles, the visibility is restricted to 10.0 miles. Since the visibility is less than the geographic range, the light will be sighted at the limit of visibility, which is 10.0 miles.