Venetian nobleman Daniello Barbaro ( 1513-1570 ) described using a camera obscura with a biconvex lens as a drawing aid.
2.
Unlike other insects, fleas do not possess compound eyes but instead only have simple eyespots with a single biconvex lens; some species lack eyes altogether.
3.
Giambattista della Porta added a lenticular crystal or biconvex lens to the camera obscura description in the 1589 second edition of " Magia Naturalis ".
4.
Thus when viewing a biconvex lens from the side, the left surface radius of curvature is positive, and the right surface has a negative radius of curvature.
5.
By changing the shape of the lens, Wollaston was able to project a flatter image, eliminating much of the distortion that was a problem with many of that day's biconvex lenses.
6.
A biconvex lens confers not only optical resolution, but aperture and low-light ability, as resolution is now decoupled from hole size & mdash; which slowly increases again, free from the circulatory constraints.
7.
The spores have dimensions of ( 3.8 ) 4.9 5.5 ( 6.6 ) by ( 3.3 ) 4.4 5 ( 6.6 ) by 3.8 4.4 ?m, sublentiform ( shaped somewhat like a biconvex lens ) in face view or roughly elliptic in side view, with an inconspicuous hilar appendage.
8.
They are commonly " lenticular " in shape ( like a biconvex lens ), measuring 1 & ndash; 3 mm in diameter . The color of the peridioles is characteristic of the genera : " Cyathus " has black peridioles, " Nidularia " and " Nidula " have brown peridioles, " Mycocalia " has yellow-to red-brown peridioles, and " Crucibulum " has black peridioles that are surrounded by a whitish membrame called the tunica, which makes them appear white.
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