Question

A light wave of requency $5\times {10}^{14}Hz$ enter a medium of refractive index $1.5$. In the medium, find out the order of velocity of the light wave

Answer 1

$answer:-$ $v=4.5\times 10{}^{-}8$ m/s

$\mu =\frac{{\lambda }_c}{{\lambda }_m}1.5=\frac{{\lambda }_c}{{\lambda }_m}{\lambda }_c=\frac{c}{f}=\frac{3\times {10}^8}{5\times {10}^{14}}=0.6\times {10}^{-6}1.5=\frac{0.6\times {10}^{-6}}{{\lambda }_m}{\lambda }_m=0.9\times {10}^{-6}=\frac{v}{f}v=0.9\times {10}^{-6}\times 5\times {10}^{14}v=4.5\times {10}^8$