. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. POLARIZED LIGHT ANALYSIS IN DAPHXIA 239 somewhat exaggerated impression of the effectiveness of this light polarization analyzer when the ratio of intensities goes to infinity at the polarization angle. The operation of this model may be seen in three dimensions in Figure 3. In Figure 3 the cone lenses are depicted on xyz coordinates to represent a solid figure. A ray of light parallel to the y axis and polarized parallel to the z axis is incident on the surmounting hemisphere of each of the cone lenses. The intensities resu


. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. POLARIZED LIGHT ANALYSIS IN DAPHXIA 239 somewhat exaggerated impression of the effectiveness of this light polarization analyzer when the ratio of intensities goes to infinity at the polarization angle. The operation of this model may be seen in three dimensions in Figure 3. In Figure 3 the cone lenses are depicted on xyz coordinates to represent a solid figure. A ray of light parallel to the y axis and polarized parallel to the z axis is incident on the surmounting hemisphere of each of the cone lenses. The intensities resulting from subsequent refractions and reflections are summarized on the figure and were taken from the 60° line of Table II where the ratio of the intensities at the light-sensing apparatus is approximately 8 to 1. Microscopic observations of the compound eye of Daphnia pulex reveal that the cone lens is not a circular solid cone of 45° surmounted by a hemisphere. Con-. FIGURE 3. Three-dimensional diagram of the Brewster-Fresnel internal reflection model showing two cone lenses at right angles. Light rays are incident parallel to the y axis with an intensity of 100, and polarized parallel to the yz plane. The numbers represent calculated intensities at the various parts of the light path. siderable variation in shape and contour is observed in the lenses of the eyes studied. In particular, one type of cone lens has a rather special shape in which the contours exhibited are of considerable theoretical interest because they are com- parable to those predicted and drawn on paper from simple geometrical optical considerations. Starting with the knowledge that the light-sensing apparatus lies at the tip of the cone lens and with the constraint that the angle of the cone should be approximately 45° we may reconstruct the light path FDBA of Figure 1 through the cone lens step by step, starting at the apex and working backward to the outside. Please note that these images are extrac


Size: 1929px × 1295px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology