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In many transparent materials, dispersion causes different colors (wavelengths) of light to travel at different speeds.

In many transparent materials, dispersion causes different colors (wavelengths) of light to travel at different speeds. This can cause problems in fiber-optic communications systems where pulses of light must travel very long distances in glass. Assuming a fiber is made of silicate crown glass (see figure below), calculate the difference in travel times that two short pulses of light take to travel 15.4 km in the fiber if the first pulse has a wavelength of 700 nm and the second pulse has a wavelength of 500 nm.
n500= 1.55
n700= 1.50
Δt =
Need Help finding Delta-t

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