I love these descriptions of how flat and regular the Zeiss mirrors need to be for ASML EUV lithography.

The accuracy required would allow you to shoot a golf ball on the moon with a laser.

Or put differently, if you were to extend the mirror over the size of Germany, the imperfection would be at most 20 micrometer, thinner than hair.
bookwyrm.social/user/fj/quotat

0

If you have a fediverse account, you can quote this note from your own instance. Search https://mastodon.social/users/fj/statuses/114092304252440150 on your instance and quote it. (Note that quoting is not supported in Mastodon.)