The book Elements of Acoustics, Light, And Heat was written by author William Lees Here you can read free online of Elements of Acoustics, Light, And Heat book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Elements of Acoustics, Light, And Heat a good or bad book?
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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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