"Focal length?" NYT crossword answer is:ATTENTIONSPAN (13 letters length)
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Focal length is a term used in optics to describe the distance between the lens and the point at which light rays converge to form a sharp image. It is a key factor in determining the magnification of an image, and is often used in photography to adjust the field of view. Focal length is often abbreviated as "FL" and can be measured in millimeters.