ABSTRACT

60The diffraction integrals in (4.19) and (4.20) may be expressed as a complex sum of two double integrals of the form () I = ∫ ∫ g ( x , y )  exp [ i f ( x , y ) ]   d x   d y https://s3-euw1-ap-pe-df-pch-content-public-u.s3.eu-west-1.amazonaws.com/9780203733998/208081a0-2067-4653-868e-44135a74679a/content/eq213.tif"/>