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○ Lens Formula

1/f=(n-1){(1/r1)-(1/r2)}+{(n-1)(n-1)t}/{nr1r2} 　　

　ｆ；focus ｎ；refractive index ｔ；thickness(center)

ｒ１；curvature(first surface) ｒ２；curvature(second surface)

○ The first surface curvature that it gets a minimum aberration(in the case of parallel ray)：ｒ１

r1={2(n-1)(n+2)f}/{n(2n+1)}

※ for ＺｎＳｅ

ｒ１＝０．８８５ｆ

○ Principal point locations :x

ａ．Principal point of menisucus lens

x={(2n+1)t}/{2(n+2)}

※ for ＺｎＳｅ

x＝０．６５９ｔ

ｂ．Principal point of plano convex lens

x= t/n

※ for ＺｎＳｅ

ｘ＝０．４１７ｔ