A pencil appears bent when partially submerged in water. Which scenario best explains how understanding refraction can help design better aquarium displays?
Positioning lighting to account for refraction can make fish appear in their true locations to viewers
Refraction is the bending of light as it passes from one transparent medium to another of different optical density. Water has a refractive index of about 1.33 while air is close to 1.00, so a light ray coming from a fish bends away from the normal as it leaves the water and reaches the viewer's eye.
Because the eye traces the ray back in a straight line, the fish is seen along that shifted direction. The fish therefore looks displaced from its true position, and often shallower than it really is, exactly as the submerged part of a pencil looks bent.
An aquarium designer who understands this can angle the lamps and viewing panels so that the light path is corrected, letting visitors see each fish where it truly swims rather than in an offset apparent position.
Water temperature changes refractive index only very slightly, coloured backgrounds only alter contrast, and mirrors merely add reflections; none of these fixes the apparent shift caused by refraction.
Hence, positioning lighting to account for refraction so that fish appear in their true locations is the correct scenario.
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