Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
(a) Simulations of normalized intensity (at image center) of a 100 nm virus as a function of illumination NA and focus position. (b) The defocus profiles when illumination angles are restricted to a single plane wave (NA = 0), or NA = 0.45 or NA = 0.9.
