Translations:Snell's law/6/en

${\frac {\sin i}{V_{1}}}={\frac {\sin \theta _{p1}}{V_{p1}}}={\frac {\sin \theta _{s1}}{V_{s1}}}={\frac {\sin \theta _{p2}}{V_{p2}}}={\frac {\sin \theta _{s2}}{V_{s2}}}=p$,