the image formed by a concave mirror cannot lie within the ---- and -----
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what is your question I can't understand
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-Virtual image cannot be formed from a virtual object.
- When object is placed between pole and focus, image formed by the concave mirror is magnified, virtual and erect.
-When object is placed beyond centre of curvature , image of it is formed between centre of curvature and focus which is diminished,real and inverted,so real image of real object can be formed by concave mirror.
-When object is virtual, image formed is real for concave surface as shown in figure.
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