What is meant by focal point??
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the point at which rays or waves meet after reflection or refraction, or the point from which diverging rays or waves appear to proceed.
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In geometrical optics, a focus, also called an image point, is a point where light rays originating from a point on the object converge. ... A principal focus or focal point is a special focus: For a lens, or a spherical or parabolic mirror, it is a point onto which collimated light parallel to the axis is focused.
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the point at which rays or waves meet after reflection or refraction, or the point from which diverging rays or waves appear to proceed.
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