- #1

stunner5000pt

- 1,461

- 2

N(1000) =1.45

Estimate Vphase and group velocity using the above info.

i know that [tex] n = \frac{c}{v_{\phi}} = \frac{ck}{\omega} [/tex]

i can't simply susbtitute into that above relation because the lambda given is that lambda in the vacuum and thus the lambda would be different in the medium. Also oncei found v phase how would i go about finding group velcoity, since group velocity is a derivative, do i simply pick off two points on the graph and find the slope?

But first i need to figure out phase velocity which i can't get and i don't know if its right

Please help!