1.

Light has wavelength 600 nm in free space. Itpasses into glass, which has an index of refractionof 1.50, What is the frequency of the light insidethe glass?

Answer»

The speed of light is 299792458m/s. For this case, we will use the approximation 3.0*10^8m/s.

Since frequency = speed/wavelength:

Frequency of light = (3.0*10^8)/600nm= (3.0*10^8)/[600*10^(-9)m]= 5.0*10^14 Hz

When light changes medium, only the wavelength changes, not the frequency. So, the answer is 5.0*10^14 Hz.



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