Definition: curving outward
Definition: curving outward
Sentences Containing 'convex'
Lenses are very similar to prisms; indeed, two prisms placed as in Figure 69, and rounded off, would make a very good convex lens.
The distance of the principal focus from the lens is called the focal length of the lens, and from the diagrams we see that the more convex the lens, the shorter the focal length.
Suppose we place an arrow, A, in front of a convex lens -LRB- Fig.
Let a convex lens be placed near a candle -LRB- Fig.
Farsightedness can be remedied by convex glasses, since they bend the light and bring it to a closer focus.
Convex glasses, by bending the rays and bringing them to a nearer focus, overbalance a short eyeball with its tendency to focus objects behind the retina.
Supposing there is a convex curve on the one side, you will often have a concave form on the other.
-LRB- -RRB- The knife, which is shaped like a crescent, that cuts with the convex side, falls from a less height, and that is all the difference.
In certain star-fishes, small depressions in the layer of pigment which surrounds the nerve are filled, as described by the author just quoted, with transparent gelatinous matter, projecting with a convex surface, like the cornea in the higher animals.
In ordinary combs it has appeared to me that the bees do not always succeed in working at exactly the same rate from the opposite sides; for I have noticed half-completed rhombs at the base of a just-commenced cell, which were slightly concave on one side, where I suppose that the bees had excavated too quickly, and convex on the opposed side where the bees had worked less quickly.
In one well-marked instance, I put the comb back into the hive, and allowed the bees to go on working for a short time, and again examined the cell, and I found that the rhombic plate had been completed, and had become PERFECTLY FLAT: it was absolutely impossible, from the extreme thinness of the little plate, that they could have effected this by gnawing away the convex side; and I suspect that the bees in such cases stand in the opposed cells and push and bend the ductile and warm wax (which as I have tried is easily done) into its proper intermediate plane, and thus flatten it.
This august hump, if I mistake not, rises over one of the larger vertebrae, and is, therefore, in some sort, the outer convex mould of it.
They keep a Whale's Rib of an incredible length for a Miracle, which lying upon the Ground with its convex part uppermost, makes an Arch, the Head of which cannot be reached by a Man upon a Camel's Back.
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::: smudge - dirty mark with unclear edges made by rubbing; V.