Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Wave optics and image formation in gravitational lensing   We discuss image formation in gravitational lensing systems using wave
optics. Applying the Fresnel-Kirchhoff diffraction formula to waves scattered
by a gravitational potential of a lens object, we demonstrate how images of
source objects are obtained directly from wave functions without using a lens
equation for gravitational lensing.

18
The categories of this paper are: econ
37
The categories of this paper are: supr-con
7
The categories of this paper are: hep-th
25
The categories of this paper are: patt-sol
35
The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
30
The categories of this paper are: q-alg
29
The categories of this paper are: funct-an
21
The categories of this paper are: adap-org
9
The categories of this paper are: nlin
26
The categories of this paper are: bayes-an
15
The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph
1
The categories of this paper are: cs
10
The categories of this paper are: q-bio
11
The categories of this paper are: hep-lat