Lecture27

Lecture27 - 29 x y z k k k k r 29 r x y z r x y z E E...

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The 3D wave equation for the electric field is actually a vector equation! which has the solution: where and and 0 ( , , , ) exp[ ( )] E x y z t E i k r t ϖ = ⋅ - r r r r % % x y z k r k x k y k z + + r r 2 2 2 0 E E t με - = r r r A light-wave electric field can point in any direction in space:
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Unformatted text preview: ( 29 , , x y z k k k k ≡ r ( 29 , , r x y z ≡ r ( , , ) x y z E E E E = r % % % % Note the arrow over the E....
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