Homework Statement
I'm taking an introduction course in optics and I came across this exercise which I can't find how to solve:
"Two light pulses with different wave lengths 500 and 600 nm is sent into a 1 km long fiber.
n(610 nm) = 1.399, n(600 nm) = 1.400, n(510 nm) = 1.448, n(500) = 1.45...