Doubts concerning the inversion of objects on the retina / by Marmaduke Berdoe.

  • Marmaduke Berdoe
Date:
1772
Catalogue details

Licence: Public Domain Mark

Credit: Doubts concerning the inversion of objects on the retina / by Marmaduke Berdoe. Source: Wellcome Collection.

    33/98 (page 27)
    [ *7 ] Let the crofs, A B C D, fig. 4, repre* fent the inverfion of the ohje.61 which hap- pens in the camera obfcura. Should a fpec- tator placed within the room as at S, look on the reprefentation of the objefl C againfl the wall, it ought according to the rules of vifion eflablifh’d by Kepler, to be painted on the retina in its true pohtion ABa For the rays of light reflefled back from the wall C D, fhould by the decuffation of their rays in traverfing the different humors of the eye, reprefent the crofs in an invert¬ ed fituation to CD. on the retina of the eye of the fpeffator S, But it is very evident from every man’s own ex- . V * perience, that if I turn my eyes towards the wall, and look at the objefl CD, I fee it in its inverted fituation, as the eye would do at F. The feffators of Kepler will, no doubt, obferve that the fame thing happens by the influence of the foul in correfling the inverfion of the objeff CD, on the retina of the fpe&ator S, fo that he fees k D 2 m *• 1