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In an indoor pool, I have noticed a distinctive shadow of the swimming lane lines on the bottom of the pool, whereas people swimming there do not leave shadows.

No shadows of the swimmers can be understood, considering many light sources on the ceiling and light refraction on the ripples.

But why do the lane lines leave shadows?

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  • $\begingroup$ Do floating people leave shadows? $\endgroup$
    – Jon Custer
    Commented Jan 5, 2023 at 15:13
  • $\begingroup$ Are the ceiling lights in rows that run parallel to the lane markers? $\endgroup$
    – Michael Seifert
    Commented Jan 5, 2023 at 15:13
  • $\begingroup$ Does shadow moves if you shake the lane lines? $\endgroup$
    – Haris
    Commented Jan 5, 2023 at 15:24
  • $\begingroup$ See the wave imaged at the bottom by the refraction of light: youtube.com/watch?v=jtmI5nlPnVY ------ en.wikipedia.org/wiki/Refraction $\endgroup$
    – The Tiler
    Commented Jan 5, 2023 at 15:29
  • $\begingroup$ The concave and convex parts of surface waves play the roles of converging and diverging lenses: en.wikipedia.org/wiki/Lens $\endgroup$
    – The Tiler
    Commented Jan 5, 2023 at 15:44

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