15.2 The Behavior of Electromagnetic Radiation

• This causes interference, which reinforces the intensity of the wavelengths of light that create the bands of color
• Light with an electric field that vibrates in only one direction is called polarized
• Polarized glasses are an example of a polarizing filter.
• The rate at which light is radiated from a source is called luminous flux, P, and it is measured in lumens (lm).
• The number of lumens per square meter is called illuminance, and is given in units of lux (lx)
• EM radiation travels at different speeds in different media, produces colors on thin films, and can be polarized to oscillate in only one direction.
• Calculations can be based on the relationship among the speed, frequency, and wavelength of light, and on the relationship among luminous flux, illuminance, and distance.