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The dark matter in Abell 3827 bent the path of light rays coming from a distant background galaxy, which happened to be aligned just right for the team's purpose.
The adaptive metalens focuses light rays onto an image sensor.
Very few entering photons (light rays) will get out.
(The traced rays thus actually travel in the opposite direction to real light rays).
Due to the expanded cone shape which light rays create when transmitted - there would be no reflector that could 'catch' all of the light rays.
Those light rays may be virtual, but the book this scene pops out of is not.
The paths of the light rays in Fig. 1b (shown as lines) show the cloaking mechanism.
Light rays tracing are carried out in the concentrator.
Your shadows show the direction of the rays of light from the lamp, and the light rays are clearly divergent.
All are caused by the bending of light rays before they meet the observer's eyes.
Generally speaking, this means that initially parallel light rays eventually cross or diverge.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com