The dual nature of light means that, in some experiments, light behaves as a wave. ... The light waves interfered with each other and formed an alternating pattern of light and dark bands; the light bands are the constructive interferences, and the dark bands are the destructive interferences.
In the context of U.S. history, the term “carpetbagger” is used to describe Northerners who moved to the South after the Civil War, during Reconstruction (1865 to 1877).
