光线入射条件 (dr/dS)Ir sine,Trosino(ro) (rdp/dS)川ro sine,(roose(ro) dz (dz/ ds)lro cosh(ro) rodo r=rr+zzr0 d dr r e  e   r 0 ds dz r r e  e z e  z  z x y z (dr ／dS) |r 0 ＝sinθ z (r 0 )sinθ φ (r 0 ) (r dφ ／dS)|r 0 ＝sinθ z (r 0 )cosθ φ (r 0 ) (dz ／dS)|r 0 ＝ cosθ z (r 0 ) 光线入射条件 r 0 r = r rˆ + zzˆ 