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What are the characteristics of concave mirror?
Characteristics of concave mirrors:

    The focal length is positive (because the object and the focus are on the same side of the mirror)
    The object and the focus are on the same side of the mirror (inside the arc)
    Real images can be formed by the mirror when the object is outside of the focus; an inverted image is formed
    Virtual images are formed by the mirror when the object is within the focus; an erect image is formed
    No image is formed when the object is at the focus
    When the object is at the center of curvature, an inverted image is formed at the center of curvature .


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