How are heat waves transparent but also have shadows?
In: 3
The change in density causes lensing which redirects light. When you see things rippling on the other side that means some light is being directed away from your eyes and replaced by light from another point.
If you laid down on the ground facing the sun (don’t do this) then the lensing will direct some of the light from the sun away from you and that makes a slightly dimmed shadow.
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