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## Main Question or Discussion Point

Hi,

I'm taking an undergrad course in Electromagnetism and Optics, and in the lecture notes it reads:

"Consider the formal equation ε

Could anyone help me as to where this equation comes from?

I'm taking an undergrad course in Electromagnetism and Optics, and in the lecture notes it reads:

"Consider the formal equation ε

_{0}**D⋅E**= 1 ... that must be obeyed for waves travelling in different directions as defined by the wave vector**k**but with a given energy density."Could anyone help me as to where this equation comes from?