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 n1sinθ1=n2sinθ2 or n1n2=sinθ2sinθ1n1sinθ1=n2sinθ2 or n1n2=sinθ2sinθ1
Snell’s law in terms of speed sinθ1sinθ2=v1v2sinθ1sinθ2=v1v2
critical angle θc=sin−1(n2n1), for n1>n2
power and focal length P=1fP=1f
mirror/lens (or thin-lens) equation 1f=1di+1do1f=1di+1do
rearranged mirror/lens equation di=fdodofdi=fdodof
magnification equation m=hiho=didom=hiho=dido