What is light? Scientists have asked this question for centuries.
Early scientists wondered: How do we see? How does light move? How fast is light?
How do we see?
- How do we see? Explaining how we see in three dimensions was difficult.
- How does light move? Pinhole cameras show how light rays travel in straight lines.
- How does light move? Lenses show how light rays can bend.
- How fast is light? For a long time light was too fast to measure.
James Clerk Maxwell discovered visible and invisible waves of light.
Is light a wave or a particle? Light is both waves and particles!
Medieval anatomy of the eye
Early x-ray image of a hand
Interference in surface waves