Define the focus point of a mirror
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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. ... The focus of a hyperbolic mirror is either of two points which have the property that light from one is
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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. ... The focus of a hyperbolic mirror is either of two points which have the property that light from one is reflected as if it came from the other.
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