File:Gregory telescope - finite distance to object.svg
Jump to navigation
Jump to search
Size of this PNG preview of this SVG file: 773 × 367 pixels. Other resolutions: 320 × 152 pixels | 640 × 304 pixels | 1,024 × 486 pixels | 1,280 × 608 pixels | 2,560 × 1,215 pixels.
Original file (SVG file, nominally 773 × 367 pixels, file size: 55 KB)
Captions
Captions
Add a one-line explanation of what this file represents
Summary[edit]
| Description |
English: A red arrow at a finite distance from a gregorian telescope focused in the same plane (F) as if it was at infinite distance by moving the elliptical secondary mirror (M2) the distance d away from the parabolical primary mirror (M1). Green dotted lines for construction of primary image and blue dotted lines for constructing secondary image from primary image. Yellow line shows an actual light-ray through telescope. Red line shows optical axis. Red contour shows location of secondary mirror if the object was at infinite distance, so that focus of primary (F1) and close focus of secondary (F2) coincide and distant focus of secondary (also marked F2) coincide with wanted projective plane of telesocpe (F). Black zig-zag lines symbolize a lot of "cropped distance". Vertical size of secondary mirror and aperture in primary mirror exaggerated, else the lines would have been indistinguishably cluttered, and the figure is cluttered enough as it is. |
| Date | |
| Source | Own work |
| Author | Episcophagus |
Licensing[edit]
I, the copyright holder of this work, hereby publish it under the following license:
This file is licensed under the Creative Commons Attribution-Share Alike 4.0 International license.
- You are free:
- to share – to copy, distribute and transmit the work
- to remix – to adapt the work
- Under the following conditions:
- attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
- share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
File history
Click on a date/time to view the file as it appeared at that time.
| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 08:40, 25 September 2019 | | 773 × 367 (55 KB) | Episcophagus (talk | contribs) | Redrawn with reduced height. |
| 13:15, 24 September 2019 |  | 806 × 523 (49 KB) | Episcophagus (talk | contribs) | Cut away a useless piece of green dotted line. | |
| 13:03, 24 September 2019 |  | 806 × 523 (50 KB) | Episcophagus (talk | contribs) | User created page with UploadWizard |
You cannot overwrite this file.
File usage on Commons
There are no pages that use this file.
File usage on other wikis
The following other wikis use this file:
- Usage on sv.wikipedia.org
