100 Nano-Stories: Mean Free Path!

Episode #65: Photon → Particle Interaction!

Preface! ✨

  • The optical depth is the quantity of light that has been removed due to absorption, scattering, and reflection.
  • If the optical depth is greater than 1/e or 1, the medium/material will be opaque, and photons will either be absorbed, reflected, or scatter many times before transmitting/leaving the aerogel. This means you can’t really see what’s on the other side of the material, and it can cause a haze because of the absorption or scattering of the incoming light.
  • If the optical depth is less than 1/e or 1, the medium/material will appear transparent, and photons will either transmit directly through the material without being absorbed or scattered.

Mean Free Path Explained! 💡

Definitions! 🔑

Math Equations! 🔑

Aerogel Application! 🔑

Closing Thoughts! 💭

Vocabulary! 📓

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