A new point of view is that if the angle between the normal dir-cetion of incident wave surface and Z axies is smaller, fresnel diffraction for-mation is still tru, and presented.

• 在此基础上,对费涅耳衍射近似条件作了讨论,提出此近似条件可表达为照明波波面法线与Z轴夹角很小时,费涅耳衍射成立的新论点。