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Are there any other non dispersive media for light besides air/ vacuum. That is, is there any other medium in which all EM radiations will travel with the same velocity?
- Annie (age 18)
I think only a vacuum is a non-dispersive medium. Air doesn't disperse light a lot, because the air is not very dense. However, as you've no doubt noticed, the sky is blue. That means that air does scatter light by a frequency-dependent amount. Basically, any scatterer has some frequency dependence so they're all dispersive.
(published on 03/29/11)
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