Refraction and Reflection
(approx 300,000 km per second)
Light travels slower in other materials such as glass
- The velocity of electromagnetic energy in a vacuum is commonly known as the speed of light
(approx 200,000 km per second).
Light travelling from one material to another changes speed, resulting in a change in
direction of travel. This deflection is known as refraction.
Different wavelengths of light
travel at different speeds in an identical medium. This variation of velocity with wavelength plays an
intergral role in fiber optics.
The index of glass can be controlled by changing its composition.
The Network Wiring Virtual Lecture by L. Scott Freudenthal