Cowperwood smiled urbanely. "Will a forty-thousand-dollar lens be a better lens than any other lens?" he inquired. "Made by Appleman Brothers, of Dorchester, it will," replied the college president. "The whole story is here, Mr. Cowperwood. These men are practical lens-makers. A great lens, in the first place, is a matter of finding a suitable crystal. Large and flawless crystals are not common, as you may possibly know.英文原著 · 《The Titan》
Fig 5 represents a double-convex lens, Fig. 6 a double-concave, and Fig. 7 a concavo-convex or meniscus. By these it is seen that a double-convex lens tends to condense the rays of light to a focus, a double-concave to scatter them, and a concavo-convex combines both powers.英文原著 · 《American Hand Book of the Daguerreotype》
Spherical aberration is overcome by proper care in the formation of the lens: "It can be shown upon mathematical data that a lens similar to that given in the following diagram--one surface of which is a section of an ellipse, and the other of a circle struck from the furthest of the two foci of that ellipse--produces no aberration.英文原著 · 《American Hand Book of the Daguerreotype》
The camera is a dark box (a), having a tube with lenses (b) placed in one end of it, through which the radiations from external objects pass, and form a diminished picture upon the ground glass (g) placed at the proper distance in the box to receive it; the cap c covering the lenses at b until the plate is ready to receive the image of the object to be copied.英文原著 · 《The History and Practice of the Art of Photography》
Thus a (fig. 6.) representing the lens, and b the object desired to be represented, the rays (c, c) proceeding from it fall upon the lens, and are transmitted to a point, which varies with the curvature of the glass, where an inverted image (d) of b is very accurately formed. At this point, termed the focus, the sensitive photographic material is placed for the purpose of obtaining the required picture.英文原著 · 《The History and Practice of the Art of Photography》
My Dear Marshal, -- In an hour Lens will be in the enemy's
possession. Come and rejoin me; bring with you the whole
army. I shall be at Vendin to place it in position. To-morrow we shall retake Lens and beat the enemy."英文原著 · 《Twenty Years After》
But you don't realize, Taylor, that glass, it's not a barrier, it's a lens.美剧 · 《Billions》
If we look at it through this lens, it's possible Wendy has taken an interest in me to fuck with you.美剧 · 《Billions》