Why Does Light With Less Wavelength Run Faster in Glass?

  • Thread starter Thread starter Hepic
  • Start date Start date
  • Tags Tags
    Light
AI Thread Summary
Light with longer wavelengths travels faster in glass compared to light with shorter wavelengths due to differences in how they interact with the material's atomic structure. This phenomenon is linked to the concept of diffraction, where shorter wavelengths experience more scattering and thus slower propagation. The discussion references Richard Feynman's lectures on Quantum Electrodynamics (QED) for deeper insights into these principles. Understanding the underlying physics requires exploring the relationship between wavelength, speed, and material properties. These concepts are crucial for grasping the behavior of light in various mediums.
Hepic
Messages
118
Reaction score
0
1)I know that light with more wavelength run faster in the glass from an other with less.But why? If you tell me because has less diffract I will ask again,why it has less?
 
Science news on Phys.org
Watch these public outreach lectures on QED by Feynman.

http://vega.org.uk/video/subseries/8

The second one, I think, contains a section on diffraction, specifically. He also talks at length about the question of "what does it mean".
 
I would like to use a pentaprism with some amount of magnification. The pentaprism will be used to reflect a real image at 90 degrees angle but I also want the reflected image to appear larger. The distance between the prism and the real image is about 70cm. The pentaprism has two reflecting sides (surfaces) with mirrored coating and two refracting sides. I understand that one of the four sides needs to be curved (spherical curvature) to achieve the magnification effect. But which of the...
Back
Top