As mentioned, transparent objects do not cast shadows at all. But if we hold a glass or a ruler over a tile, paper then we can see a very faint shadow. Why is it so?

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Solution

as answered previously.
Shadows are formed when an opaque object is placed in the path of light rays. The rays go past the edges of the object and make a shadow.
This is true that water (or a common ruler) is transparent, but, when the bulk volume of water flows it almost acts as an obstructing object which blocks the ray of light and shadow is formed.

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