Click here if you are having trouble logging into the forums
Privacy Policy |
Please read our Terms
of Service | Signup and
Troubleshooting FAQ | Problems? PM a Red or a Green Gu.... uh, User
Ed Jones
Pooh-Bah
Reged: 04/06/04
Posts: 1415
Loc: Sin-sin-atti
|
Re: flat mirror tests
07/02/09 03:38 PM
|
|
|
It's not the refraction, it's just that without a lens the light goes through at different angles without a collimator. Different angles equate to rings of fringes that aren't real, a result of the long path length in water. I had to learn this lesson the hard way so I want to be sure others avoid this mistake.
If you have a flat that you know is pretty good try the water test without a lens and you'll see many rings of power to demonstrate this effect. Up close many rings, fewer when you are farther away.
But you got fringes so you've mastered the hard part of this test.
--------------------
Ed Jones
|
|
9 registered and 8 anonymous users are browsing this forum.
Moderator: Don W, Mike I. Jones
|
Forum Permissions
You cannot start new topics
You cannot reply to topics
HTML is disabled
UBBCode is enabled
|
Rating:
Thread views: 1093
|
|
|
|
|
|
|
Previous
Index
Next
Flat
Edit
Reply
Quote
