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[" A plane electromagnetic wave "],[E(z)...

[" A plane electromagnetic wave "],[E_(z)=10cos(6times10^(8)t+4x)V/m],[" is propagating in a medium of refractive "],[" index,"],[[" 1) "1.2," 2) "1.5],[" 3) "2.0," 4) "2.4]]

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