Scientific philosophy

On of my co-workers' kids asked her if windows cast shadows. I concluded that thick enough glass blocks all light so windows must block a tiny bit of light so yes it does cast a shadow.

This let to another question I've pondered from time to time. Is the area under a magnifying glass that isn't the focal point a shadow? The ring that holds the lens does block light so it casts a shadow. But the area between that shadow and the focal point just has the light bent away from it... the light isn't really blocked, just redirected.

Here's what I mean.


What do you think? Is that area in shadow or not?