Reflection

 All what we see is actually reflected light.

All Things Reflected
What is it about objects that let us see them? Why do we see the road, or a pen, or a best friend? If an object does not emit its own light (which accounts for most objects in the world), it must reflect light in order to be seen. The walls in the room that you are in do not emit their own light; they reflect the light from the ceiling "lights" overhead. Polished metal surfaces reflect light much like the silver layer on the back side of glass mirrors. A beam of light incident on the metal surface is reflected.
Arizona State University, The Reflection Of Light, 2000

Everything we see is actually reflected light. However this was portrayed in the Quran 1400 years before it was discovered.

[Quran 27.40] He who had knowledge from the Book said, "I will bring it to you before your glance reflects to you." And when he saw it settled before him, he said, "This is from the grace of my Lord, to test me, whether I am grateful or ungrateful. He who is grateful, his gratitude is to his own credit; but he who is ungrateful, my Lord is Independent and Generous."

Yartada in Arabic يَرْتَدَّ  means bounce off something. This verse says that our glance is a bounce off something. It turned-out to be that everything we see is actually reflected light.

How could an illiterate man who lived 1400 years ago have known that we see reflected light?

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