what is the focal length of a lens
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Definition: Focal length. Focal length.Focal length (shown in red) is thedistance between the center of a convex lens or a concave mirror and the focal point of the lens or mirror — the point where parallel rays of light meet, or converge.
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pleqse explain me.....wheres red ?
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That point where the parallel rays of light beam converge on concave or convex lens is known as focal of the lens and the distance of focal point from centre of lens is known as focal length...
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