Which optical illusion makes ships appear to float above the water?

• A. Fata Morgana
• B. Mirage
• C. Refraction
• D. Horizon

Answer: (A)

Light bending in the atmosphere caused by temperature differences creates dramatic optical distortions. When a warm layer sits over cooler air near the water, light rays bend downward as they move toward your eye, altering where distant objects appear. A fata Morgana is a particularly complex, elevated type of this effect—a superior mirage that stacks and stretches images, so the light from a distant ship is displaced upward. Because of that upward displacement, the ship can look as if it’s hovering above the water rather than sitting on it. This floating illusion is characteristic of a fata Morgana, higher and more dramatic than a simple mirage. The horizon is just the distant boundary you’d see anyway, and refraction is the general process behind all these illusions—what makes them possible, while the specific floating appearance points to a fata Morgana.