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https://www.youtube.com/watch?v=YW8KuMtVpug&feature=iv&src_vid=CiHN0ZWE5bk&annotation_id=annotation_187211

Start the above video at 8:15. How does the phase velocity affect the apparent velocity of light in a medium? From my understanding a phase shift will change the direction of light, but how does this affect the "apparent" velocity?

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closed as too broad by Carl Witthoft, user36790, Kyle Kanos, Sebastian Riese, Gert Nov 16 '15 at 14:40

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

  • $\begingroup$ see the Snell's law wiki $\endgroup$ – user46925 Nov 16 '15 at 10:13