University Physics Volume 3

# Key Equations

### Key Equations

 Speed of light $c=2.99792458×108m/s≈3.00×108m/sc=2.99792458×108m/s≈3.00×108m/s$ Index of refraction $n=cvn=cv$ Law of reflection $θr=θiθr=θi$ Law of refraction (Snell’s law) $n1sinθ1=n2sinθ2n1sinθ1=n2sinθ2$ Critical angle $θc=sin−1(n2n1)forn1>n2θc=sin−1(n2n1)forn1>n2$ Malus’s law $I=I0cos2θI=I0cos2θ$ Brewster’s law $tanθb=n2n1tanθb=n2n1$