Define focus in science reflection of light
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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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Focus - The point on the principle aixs at which the incident rays which are parallel to the principle axis, meet after reflection from the mirror is called focus.
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