Hi, this is a comment.
To get started with moderating, editing, and deleting comments, please visit the Comments screen in the dashboard.
Commenter avatars come from Gravatar.
Bei einzelnen dünnen Linsen ist die Brennweite f gleich dem Abstand des Brennpunkts F von der Linsenmitte. Bei gewölbten Spiegeln ist es der Abstand vom Spiegelscheitel.
Hi, this is a comment.
To get started with moderating, editing, and deleting comments, please visit the Comments screen in the dashboard.
Commenter avatars come from Gravatar.