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The Path of a Ray through a Lens

المؤلف:  GEORGE A. HOADLEY

المصدر:  ESSENTIALS OF PHYSICS

الجزء والصفحة:  p-467

2025-12-18

566

Suppose the ray to come from the point P on the principal axis and to strike a crown-glass lens at the point A (Fig. 1). The direction AB through the lens may be found as follows:

Describe from A as a center two arcs of circles with radii that are to each other as 3: 2 (3/2 being the index of refraction of the lens). From E, the intersection of the ray with the inner arc DE, draw a line parallel to the normal DA, and from H, where the parallel intersects the outer arc, draw HA and prolong it to В.

In a similar way we can determine the direction, ВК, that the ray will take on emerging from the lens.