"Every point on a wave front can be considered as a source of tiny wavelets that spread out in the forward direction at the speed of the wave itself. The new wave front is the envelope of all the wavelets... that is, tangent to all of them."
The bending of waves behind obstacles in the "shadow region" (proves light can be a wave)
Double slit experiments,should see two slits of light but instead get a series of bright lines
When wave amps add together to form a larger amplitude, creative a bright area
When wave amps are exactly out of phase and add together to create an amp of zero, creating dark lines (also called fringes)
Order of the fringes, where the center spot is 0
Sources with the same wavelength and frequency, and bear the same phase relationship to each other at all times
Interference patterns will only occur with coherent sources
The energy light carries per unit area per unit time
When light spreads into the colors it's made up of, most commonly when white light spreads into the full spectrum
Bright and dark fringes from a single slit, resembling a double slit, due to interference of waves diffracted around the slit or whatever
Exists around any sharp object illuminated by a point source
A large number of equally spaced parallel slits
Pattern resulting from light spread out into its component wavelengths by a diffraction grating
Where only certain discrete wavelengths of light are emitted. These are different for different elements and compounds.
Thin film interference
When different wavelengths of light are reflected vs continue through by two different mediums, one on top of the other, creating colorful reflections seen on soap bubbles, thin layer of oil on water, etc.