Scientific amusements . us point is infront, and the images reflected have the same appearance,but reversed. There is another law, which is that theangular velocity of a beam reflected from a mirror is twicettiat of the mirror. The Kaleidoscope, with which weare all familiar, is based upon the fact of the multipli-cation of images by two mirrors inclining towards eachother. A concave mirror is seen in the accompanying diagram,and may be called the segment of a hollow sphere—V w. The point C is the geometrical ccentre, and o c the radius; Fis the focus ; the line passingthrough it is the optica
Scientific amusements . us point is infront, and the images reflected have the same appearance,but reversed. There is another law, which is that theangular velocity of a beam reflected from a mirror is twicettiat of the mirror. The Kaleidoscope, with which weare all familiar, is based upon the fact of the multipli-cation of images by two mirrors inclining towards eachother. A concave mirror is seen in the accompanying diagram,and may be called the segment of a hollow sphere—V w. The point C is the geometrical ccentre, and o c the radius; Fis the focus ; the line passingthrough it is the optical axis;o being the optical perpendicular rays passthrough C. All rays fallingin a direction parallel with theoptical axis are reflected andcollected at F. Magnifiedimages will be produced, andif the object be placed between the mirror and the focus,the image will appear at the back ; while if the object beplaced between the geometrical centre and the focus, theimage will appear to be in front of the Concave mirror. MIRRORS. 39 We can understand these phenomena by the accom-panying diagrams. Suppose a ray, A n, passes from oneobject, AB, at right angles, it will be reflected as nKC, theray, A C, being reflected to F. These cannot meet in front
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Keywords: ., bookcentury1800, bookdecade189, booksubjectscientificrecreations
