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Practice MCAT Question - Q5 - Answer!

Glass has an index of refraction of 1.50. What is the frequency of light that has a wavelength of 500 nm in glass?

A.  1.00 Hz
B.  2.25 Hz
C.  4.00 x 1014 Hz
D.  9.00 x l016 Hz

The correct answer is (C). The velocity of light in glass can be found from the definition of refractive index, n = c/v; wavelength and frequency are related to velocity by the general wave relation, v = wavelength * frequency; therefore:

frequency = v / wavelength = c / n * wavelength
                 = (3.00 x 108 m/s) / (1.50)(500 x 1029 m)
                 = 4.00 x 1014 Hz

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