In this chapter we consider classical and quantum mechanical descriptions of electromagnetic radiation. We develop expressions for the energy density and irradiance of light passing through a homogeneous medium, and we discuss the Planck black-body radiation law and linear and circular polarization. Readers anxious to get on to the interactions of light with matter may skip ahead to Chap. 4 and return to the present chapter as the need arises.


Refractive Index Electromagnetic Radiation Circular Polarization Horizontal Polarizer Propagation Axis 
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© Springer-Verlag Berlin Heidelberg 2009

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