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.

    71/98 (page 61)
    / [ 6i ] of thofe parallel rays which are connefled with the center of the medium, and which are not fubjedted to fo great a degree of iu adtion. 6thly. But there are mediums, whole a&ion on the rays of light are fo powerful, that they change the courfe of their direc¬ tion entirely, and alter the natural pofitkm of the objects. Of this kind are all globular diaphane bodies, or any fpherical or convex lens, whofe Tides are the part of fome feg- ment of a circle, or its periphery0 This is the mod uncommon and furprizing phe¬ nomenon of the whole fydem of optics. Its theory is the mod difficult to explain, for which reafon we diall endeavor to eluci¬ date it in the mod probable manner, and reduce it to certainty.—We beg leave to call to mind the invariable dire£!ion of the rays of light to a condant re&ilinear progreffion, and the poffibility of their being diverted from that courfe by the power of certain inter-