Formula for Convex Lenses
المؤلف:
GEORGE A. HOADLEY
المصدر:
ESSENTIALS OF PHYSICS
الجزء والصفحة:
p-470
2025-12-20
17
Formula for Convex Lenses.The relative positions of an object and its image formed by a convex lens can be determined if the principal focal length is known, and vice versa. The formula, like that for concave mirrors, is,
in which F is the focal length, D the distance of the point P from the lens, and Di the distance of its image from the lens. If we let Si represent the length or diameter of the object, and Si that of the image, then a simple geometrical construction shows that S.: Si = D.: Di.
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