When a light is first seen on the horizon it will disappear again if the height of eye is immediately lowered several feet. When the eye is raised to its former height the light will again be visible. This process is called __________.

Correct Answer: Option C — bobbing a light

Bobbing a light is a technique used to confirm identification by observing the light's appearance and disappearance on the horizon. By changing the height of eye, a mariner can verify if the light is truly on the horizon or if it is a false target or atmospheric refraction.