Light of wavelength 589 nm in vacuum passes through a piece of fused quartz of index of refraction n = 1.458. What is the frequency of the light in fused quartz?

[Speed of light c = $3.00\times {10}^{8}m{s}^{-1}$]

A. $5.09\times {10}^{15}$Hz
B. $5.09\times {10}^{14}$ Hz  
C. $1.77\times {10}^{15}$ Hz
D. $1.77\times {10}^{14}$ Hz

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Correct Answer: B