When is the optical wavelength in vacuum, k is given by k=2 / . What – McqOptions

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1.	When is the optical wavelength in vacuum, k is given by k=2 / . What does k stand for in the above equation?
A.	Phase propagation constant
B.	Dielectric constant
C.	Boltzmann s constant
D.	Free-space constant
Answer» B. Dielectric constant

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When is the optical wavelength in vacuum, k is given by k=2 / . What does k stand for in the above equation?