Sections
Key Equations

# Key Equations

 lens/mirror equation (reciprocal version) $1f=1di+1do1f=1di+1do$ lens/mirror equation (solved version) $f=didodo+dif=didodo+di$ magnification equation $m=hiho=−didom=hiho=−dido$ radius/focal length equation R = 2f
 index of Refraction $n=cv$ Snell’s law Snell’s law in terms of speed $sinθ1sinθ2=v1v2sinθ1sinθ2=v1v2$ critical angle
 power and focal length $P=1fP=1f$ mirror/lens (or thin-lens) equation $1f=1di+1do1f=1di+1do$ rearranged mirror/lens equation $di=fdodo−fdi=fdodo−f$ magnification equation $m=hiho=−didom=hiho=−dido$