optics

How Townes and Schawlow's 1958 paper, Maiman's 1960 ruby device, and a 30-year patent war produced the most versatile tool in modern science.

Isaac Newton's biography, laws of motion, optics, and verified quirks: needle behind the eyeball, alchemy obsessions, plagiarism wars, and a life of deliberate solitude.

Mirrors don't actually flip left and right — they flip front to back. The physics of reflection, from bronze polish to the 39-meter ELT telescope.

Why is the sky blue? Learn how air scatters sunlight, why sunsets turn red, and how dust and human color vision change the colors we see overhead.

How glasses, contacts, and laser surgery correct myopia, hyperopia, astigmatism, and presbyopia — the physics and biology of clear vision.

Rainbows explained: refraction, dispersion, the 42° angle, secondary bows, Alexander's dark band, and supernumeraries. Discover how it works, why it...

Young's double-slit experiment showed light creates interference patterns—proof of wave behavior. This elegant experiment settled the light debate.

In 1666, Isaac Newton used prisms to split white sunlight into its component colors and recombined them into white again. The experiments changed how we think about light and color.

In 1800, William Herschel used prisms and thermometers to discover infrared radiation, proving that visible light is just a tiny fraction of the spectrum. A revelatory experiment on the nature of light.