apparent depth
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The apparent depth of an object in water when viewed from above. This is less than the object's real depth because of refractive effects: the light wave bends as it passes from the denser water into the less dense air.
Depth that a transparent material such as water or glass appears to have when viewed from above. This is less than its real depth because of the refraction that takes place when light passes into a less dense medium. The ratio of the real depth to the apparent depth of a transparent material is equal to its refractive index.
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