Question

Depth of swimming pool appears to be lesser than the real depth. Why?​

Answer 1

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The depth of a swimming pool always appears to be less than it actually is. This effect is due to the refraction of light rays as they traverse the boundary between water and air.

Answer 2

Answer:

Depth of swimming pool appears to be lesser than the real depth due to the refraction of light. Refraction is the bending of a wave when it enters a medium where it’s speed is different. The refraction of light when it passes from a fast medium to a slow medium bends the light ray toward the normal to the boundary between the two media. The amount of bending depends on the indices of refraction of the two media and is described quantitatively by Snell’s Law.