File:EB1911 Vision - Visual Angle.jpg
From Wikimedia Commons, the free media repository
Jump to navigation
Jump to search
EB1911_Vision_-_Visual_Angle.jpg (549 × 485 pixels, file size: 83 KB, MIME type: image/jpeg)
File information
Structured data
Captions
Summary[edit]
DescriptionEB1911 Vision - Visual Angle.jpg |
English: To understand the formation of an image on the retina, suppose a line drawn from each of its two extremities to the nodal point and continued onwards to the retina, as in the figure, where the visual angle is x. It is evident that its size will depend on the size of the object and the distance of the object from the eye. Thus, also, objects of different sizes, c, d, e in fig. 6, may be included in the same visual angle, as they are at different distances from the eye. The size of the retinal image may be calculated if we know the size of the object, its distance from the nodal point o, and the distance of the nodal point from the posterior focus. Let A be the size of the object, B its distance from the nodal point, and C the distance of o from the retina, or 15 mm.; then the size of the retinal image x = (A + 15)/B. |
||||
Date | published 1911 | ||||
Source | “Vision,” Encyclopædia Britannica (11th ed.), v. 28, 1911, p. 132, fig. 6. | ||||
Author | Unknown artistUnknown artist | ||||
Permission (Reusing this file) |
|
File history
Click on a date/time to view the file as it appeared at that time.
Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
current | 23:09, 28 August 2021 | 549 × 485 (83 KB) | Bob Burkhardt (talk | contribs) | {{Information |description = {{en|1=To understand the formation of an image on the retina, suppose a line drawn from each of its two extremities to the nodal point and continued onwards to the retina, as in fig. 6, where the visual angle is ''x''. It is evident that its size will depend on the size of the object and the distance of the object from the eye. Thus, also, objects of different sizes, ''c'', ''d'', ''e'' in fig. 6, may be included in the same visual angle, as they are at different... |
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 en.wikisource.org
Metadata
This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.
JPEG file comment | File written by Adobe Photoshop¨ 4.0 |
---|---|
Orientation | Normal |