What is the effect of refraction on a diver?

Refraction significantly impacts a diver's perception of their environment due to the way light travels through different mediums—such as air and water. When light passes from air to water, it bends, which ultimately affects how objects are perceived by a diver. As a result, objects underwater appear closer to the diver than they actually are. This phenomenon is due to the difference in the speed of light in air versus water; light slows down when it enters water, causing the visual perception of distance to be altered.

Understanding this effect is crucial for divers, as misjudging the distance to objects can impact various activities, including navigation, safety assessments, and interaction with marine life. Proper awareness of this refraction effect helps divers make informed decisions and adjustments while underwater, ensuring safety and enhancing the overall diving experience.