the point on the principal axis of a concave lens from where it been of in incident parallel appear to device is called the dash of the dash concave lens
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Explanation:
The principal focus of a lens is a point on its principal axis wherein the rays of light parallel to it and after passing through it converge (for a convex lens) or appear to diverge (for a concave lens). The principal focus of a lens is denoted by the letter F.
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Explanation:
The point is known to be "Focus"of the concave lens
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