What is meant when a medium is described as dispersive?

Related questions

1. How does NDIR sensor work?
2. Will a oxygen sensor stop a car from running?
3. What is NDIR principle?
4. How does NDIR gas analyzer work?
5. What is the range of FTIR?
6. What causes chromatic dispersion?
7. What does NDIR mean?
8. What does it mean when the carbon monoxide detector beeps once every 30 seconds?
9. Can you drive without o2 sensor?
10. Does downstream oxygen sensor affect gas mileage?

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20. #dispersive
21. #refraction