Overview of Light Propagation in Homogeneous, Source-free Media
Light can be described as a waveform propagating through free space (vacuum) or a material medium (such as air or glass). Mathematically, the (real valued) amplitude of one wave component is represented by a scalar wave function u that depends on both space and time:
where
represents position in three dimensional space, and t represents time.
Read more about this topic: Fourier Optics
Famous quotes containing the words light and/or media:
“As I sat before the fire on my fir-twig seat, without walls above or around me, I remembered how far on every hand that wilderness stretched, before you came to cleared or cultivated fields, and wondered if any bear or moose was watching the light of my fire; for Nature looked sternly upon me on account of the murder of the moose.”
—Henry David Thoreau (1817–1862)
“The media no longer ask those who know something ... to share that knowledge with the public. Instead they ask those who know nothing to represent the ignorance of the public and, in so doing, to legitimate it.”
—Serge Daney (1944–1992)