how can you find the least distance of distant objects
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The least distance of distinct vision (LDDV) or the reference seeing distance (RSD) is the closest someone with "normal" vision (20/20 vision) can comfortably look at something. In other words, LDDV is the minimum comfortable distance between the naked human eye and a visible object.
magnifying power (M) of a lens with focal length (f in millimeters) when viewed by the naked human eye:
M = 250 f .
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To find the least distance between distant objects, draw a straight line between them because the least distance between two different objects is the lenght of a straight line drawn between them.
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