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Telescope > FOCAL LENGTH
The following information is about FOCAL LENGTH.
FOCAL LENGTH Defined
The focal length of a thin, simple lens is the distance from the lens to the image it forms of an object that is very far away. For more complicated optical systems, the focal length generally does not correspond to any easily measurable distance. It is instead the focal length of a simple lens which would give the same size image of an object that is very far away.
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