Doubts concerning the inversion of objects on the retina / by Marmaduke Berdoe.
- Marmaduke Berdoe
- Date:
- 1772
Licence: Public Domain Mark
Credit: Doubts concerning the inversion of objects on the retina / by Marmaduke Berdoe. Source: Wellcome Collection.
75/98 (page 65)
![[ 65 ] • • , that the rays of light colle&ed from the top of the objeQ: A, become the lower ones of the point K, as thofe of B are the fuperior ones at H. For this veafon when the rays efcape the influence of the medium, and ex¬ pand themfelves, they reprefent the objects inverted as at H K. What is moft material to obferve relative to this circumffance is, that the inverfion of any objeft, cannot poffibly happen in optics, unlefs the rays have previoufly converged to a focal point, by the influence of a medium. ythly. We fhall endeavor to explain, (in a clearer manner) and to fhew the true rea- fon why globular, fpherical, or curvilinear tranfparent mediums, have the peculiar pro¬ perty of colledling the rays of light into a focal point.—-This circumflance depends on > ' that general proportion which all circles bear with refpedl to each other. For altho* their diameters may vary in any degree whatever, yet the circumference of the I fmallefl *](https://iiif.wellcomecollection.org/image/b30549127_0075.jp2/full/800%2C/0/default.jpg)
