For practical purposes it is not necessary to understand how a convex lens magnifies; the important thing is the fact that it does magnify.
Everybody knows, of course, that a convex lens in the right position makes things look larger.
First, you should realize that the image formed by a convex lens is not always larger than the object.
And that is why you can set fire to things by holding a convex lens in the sunlight so that the light and heat are focused on something that will burn.
With a convex lens, in a darkened room, focus the light from a candle flame so that it falls on a white screen and forms an image of the candle.
If, for example, a convex lens be moved back and forth between a candle and a screen in a dimly lighted room, a position will be found where a picture of the candle falls upon the screen.
The cornea with its inclosed liquid is a plano-convex lens, while the crystalline lens is double convex.
A refracting telescope, in which the image to be viewed is formed by the refraction of light in passing through a convex lens.
A convex lensof glass for producing heat by converging the sun's rays into a focus.
Resembling a lentil in size or form; having the form of a double-convex lens.
To facilitate the comprehension of the general action of lenses, they may be regarded as composed of two triangular prisms, with their bases in contact in a convex lens, as in fig.
I have before explained to you, the manner in which a convex lens, refracts the rays, and brings them to a focus; (fig.
The three parallel rays, A B C, are brought to a focus by the plano-convex lens, X Y, at F.
How is the focus of the plano-convex lens situated, fig.
The rays of light are refracted in a visible manner when received on a concave or convex lens, provided a little smoke from paper is employed, as in the mirror experiments.
The construction of the camera for observing the surrounding country is very simple, and merely consists of a flat mirror placed at an angle, by which the picture is reflected through a double-convex lens on to a white table beneath.
The refraction of light is also well displayed by Duboscq's apparatus, with the plano-convex lens, and a brass arrow as an object, with another double convex lens to focus it.
This may be done either by a convex lens, or by a concave mirror.
A convex lens is a flat piece of glass, having its two faces convex, or spherical, as is seen in a common sun-glass, or a pair of spectacles.
Let a person take a convex lens, and hold it about half an inch before one of his eyes; he will, by these means, render them very unequal.
In the opera glass this is a concave lens while in the other it is a convex lens.
In the case of a single plano-convex lens, the measurements must be made from both sides--first one side turned toward the light, and then the other.
Defn: Plane or flat on one side, and convex on the other; as, a plano-convex lens.
Defn: A refracting telescope, in which the image to be viewed is formed by the refraction of light in passing through a convex lens.
Defn: Resembling a lentil in size or form; having the form of a double-convex lens.
The act of reversing; the causing to move or face in an opposite direction, or to stand or lie in an inverted position; as, the reversal of a rotating wheel; the reversal of objects by a convex lens.
If parallel rays of light fall upon a double-convex lens, D D, Fig.
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.
While a real image formed by a convex lens is always inverted and smaller than the object, the virtual image is always erect and larger than the object.
The length of the image formed by a convex lens is to the length of the object as the distance of the image is to the distance of the object from the lens.
Other types employ two plano-convex lenses, the curved surfaces nearly in contact; or a concavo-convex and a plano-convex lens.
In toy lanterns it is a simple double-convex lens of short focus.
In the earlier lanterns, as still in the cheaper forms, only a single plano-convex lens or bull's-eye was employed as a condenser.
The above list will hopefully provide you with a few useful examples demonstrating the appropriate usage of "convex lens" in a variety of sentences. We hope that you will now be able to make sentences using this group of words.
