Consider an electromagnetic wave travelling in air whose dielectric constant K is 1.006 . Given that speed of light in glass is 2.0 × 1 0 8 m / s , determine K for glass.

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TestHub · Accepted Answer

(a) Speed of light in a medium is given by

$v = \frac{1}{μ ε}; ε = K ε_{0}$

Velocity of light in vacuum,

$c = \frac{1}{μ _{0} ε _{0}} v = \frac{1}{μ _{0} K ε _{0}} = \frac{c}{K} = \frac{3.00 \times 1 0 ^{8}}{1.006} = 2.99 \times 1 0^{8} m / s$

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