Elements of Acoustics, Light, And Heat

Cover Elements of Acoustics, Light, And Heat
Elements of Acoustics, Light, And Heat
William Lees
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57 to the size of the object, as the distance A' does toOA.
Fig. 47.
If the oliject be placed between tho lens and the principal focun (fig. 48), a uiii/jniilicd lOid erect image will Fig. 48 be formed. Then, of course, the image is virtual.
an arrangement constitutes the simple microscope.
Such 63. Formation of an Image by a Double Concave Lens. — ^We have seen that a double convex lens may give either a real or a virtual image, according to the distance Digitized by VjOOQlC 58 tilGHT.
of the
...object. A double concave lens gives only a virtual image at all distances. Let A B be the object (fig. 48), F C the principal axis, F the principal focus. The rays from A B, after traversing the lens, are divergent, and enter the eye as if they came from a real object at A' B', that is, there will be an image of A B seen at A' B', between the lens and the principal focus. That image is erect and smaller than the object.
54. Camera Obscura. — ^This instrument is represented Boctionally in fig.


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