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If we talk about this:
It's worth noting, then, that this isn't technically a shadow.
What you see is a slight lenticular effect. Depending on the shape of the glass, the light that passes through the glass and water is focused in the same way that we would place the lens in the sun. The light is concentrated on one (sometimes multiple) focal point of the glass, making these areas brighter. But at the same time, the light is focused away from the edge of the glass and the water, making some other areas relatively dark.
True shadows completely block light by absorption or reflection, with the exception of the edge effect of the penumbra. The lens simply changes the relative intensity of the light without interfering with its transmission by bending the light in different directions.
Light is a form of energy that stimulates our vision. Shadows are formed when light travels through space and encounters obstacles. For example, opaque materials.
Now the question is: if there is light, should there be shadows?
If there is a brighter light in front of the light, the light can cast shadows. This bright light casts a shadow of a darker light on the surface. But can we see the shadow of the light itself? No, we can't.
By definition, a shadow is an area of reduced illuminance due to partial occlusion of a light source. Objects that block light "cast" shadows.
Shadows are a relative thing.
Mirrors reflect light, and if the pattern of light hitting the mirror has an area (shadow) of less light, that amount of less light will be reflected in the same way as stronger light. Light intensity does not change the reflection behavior.
The visible result is that the mirror actually reverses the shadow we perceive.
If you put a piece of black tape on the mirror, the tape will "cast a shadow". It's an easy way to create interesting light pattern shapes and is often used in photography.
In short, objects that are brighter than the surrounding sunlight don't actually cast shadows, while objects that are (essentially) completely transparent certainly don't.
However, even a brightly glowing object will still block sunlight - so the overall brightness of the area where its shadow is located will only be illuminated by its own light - while the area outside the shadow area will be illuminated by its own light plus sunlight ......So in a sense, the shadow is still there.
There is no such thing as a 100% transparent object in the world, so even a piece of transparent glass casts a faint shadow.
Think of it this way. If an object does not block any light at all, it cannot reflect sunlight.
Therefore, an object that does not really cast shadows should be completely invisible.
In fact, nothing in the world is perfect ......So technically, everything will cast some kind of shadow.
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