what is focal length and why it is used in lens and mirror?
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f = 1/f. The focal length of a thin lens is the distance between the lens and the point at which the lens causes a ray, which was initially traveling parallel to optical axis, to intersect the optical axis.
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The focal length of a thin lens is the distance between the lens and the point at which the lens causes a ray, which was initially traveling parallel to optical axis, to intersect the optical axis.
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