If →n is the polarization vector and →k is the

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If
→
n
is the polarization vector and
→
k
is the direction of propagation of a plane electromagnetic wave, then—

1. → →
  n = k
2. → →
  n = −k
3. → →
  n⋅ k = 0
4. → →
  n× k = 0

Correct Option: C

The polarization vector and direction of travel are perpendicular to each other. n. k = 0