Lecture18

Lecture18 - kx – t – c.c where" c.c"...

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Waves using complex numbers The electric field of a light wave can be written: E ( x,t ) = A cos( kx – ϖ t – θ ) Since exp( i ϕ ) = cos( ) + i sin( ) , E ( x,t ) can also be written: E ( x,t ) = Re { A exp[ i ( kx – t – )] } or E ( x,t ) = 1/2 A exp[ i (
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Unformatted text preview: kx – t – )] + c.c. where " + c.c. " means "plus the complex conjugate of everything before the plus sign." We often write these expressions without the ½, Re, or +c.c....
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