Light has wavelength $600 \mathrm {~nm}$ in a vacuum. It passes into glass, which has an index of refraction of 1.5. What is the frequency of the light inside the glass? $\left( c = 3.0 \times 10 ^ { 8 } \mathrm {~m} / \mathrm { s } \right)$

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Quizplus · Accepted Answer

The frequency of light does not change when it passes from one medium to another. Frequency $f = \frac{c}{\lambda}$, where $c$ is the speed of light in vacuum and $\lambda$ is the wavelength in vacuum. For $600 \, \mathrm{nm} = 600 \times 10^{-9} \, \mathrm{m}$, $f = \frac{3.0 \times 10^8 \, \mathrm{m/s}}{600 \times 10^{-9} \, \mathrm{m}} = 5.0 \times 10^{14} \, \mathrm{Hz}$.

Light Has Wavelength 600 nm600 \mathrm {~nm}600 nm In a Vacuum (c=3.0×108 m/s)\left( c = 3.0 \times 10 ^ { 8 } \mathrm {~m} / \mathrm { s } \right)(c=3.0×108 m/s)

Light Has Wavelength $600 \mathrm {~nm}$ In a Vacuum $\left( c = 3.0 \times 10 ^ { 8 } \mathrm {~m} / \mathrm { s } \right)$