Figure 7.
Optical micrograph showing the gap between the two mirror surfaces. The measured gap was ∼7 µm near the mirror centre whereas the ideal gap should have been less than 5 µm.
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.