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Geometrical Construction of Images

المؤلف:  GEORGE A. HOADLEY

المصدر:  ESSENTIALS OF PHYSICS

الجزء والصفحة:  p-470

2025-12-20

536

The image which any lens will give of an object can be constructed with great accuracy. To do this two rays only are needed, from each end of the object. These rays are the secondary axis, which will pass through the optical center of the lens, and a ray parallel to the principal axis, which, after passing through the lens, will pass through its principal focus. The image of the arrow AB (Fig. 1) formed by the lens D will be A'B'. The parallel ray AG, passing through the lens in the direction GH, will then pass through C', and its intersection

with the ray A0 continued will locate the image of A at the point A'. The image of B can be found in the same way. From a consideration of the triangles ABO and A'B'O it is seen that