As Dr. Johnson said, we all know what light is, but it is not easy to tell what light is.
Craig Freudenrich was more analytical:
We see things every day, from the moment we get up in the morning until we go to sleep at night. We look at everything around us using light. We appreciate our children’s drawings, fine oil paintings, swirling computer graphics, gorgeous sunsets, blue skies, shooting stars and rainbows. We rely on mirrors to make ourselves presentable, and sparkling jewels to show affection. But did you ever stop to think that when we see any of these objects, we are not directly connected to it? We are simply seeing light – light that somehow left objects and reached our eyes, sometimes nanoseconds later, sometimes light-years. Light is all our eyes can really see.
The illustration is copyright: Elena Ray via Shutterstock
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