Focal length measurement using the method of compensation of spherical mirror

A new method for focal length measurement is presented based on the self-reference single plate shearing interferometric technique and compensation of spheri-cal mirror.The method has the advantages of simple,high accuracy and plentiful infor-mation.It can also be used for the determination of the radius of curvature of a spherical surface.Principle of the method and experimental results for different lens are given in detail.