Hacker News
new
|
past
|
comments
|
ask
|
show
|
jobs
|
submit
login
EForEndeavour
on Jan 10, 2019
|
parent
|
context
|
favorite
| on:
Hubble takes gigantic image of the Triangulum Gala...
True, and focal length is in fact defined (or at least thought of) under the assumption of parallel light rays coming in from an optically infinite distance.
https://en.wikipedia.org/wiki/Focal_length
Guidelines
|
FAQ
|
Lists
|
API
|
Security
|
Legal
|
Apply to YC
|
Contact
Search: