optics

3 articles · All tags

• How Lasers Work: Stimulated Emission and Coherent Light
  A laser amplifies light through stimulated emission to make a narrow, coherent beam of one colour. Learn population inversion, the parts of a laser, and its uses.
• Why Is the Sky Blue? Rayleigh Scattering Explained
  The sky is blue because air molecules scatter short-wavelength blue light far more than red light — Rayleigh scattering — and the same effect paints sunsets red.
• Fiber Optics and Total Internal Reflection
  How light is trapped inside hair-thin glass strands by total internal reflection — the physics that carries the internet as pulses of light.