If the object is placed at the centre of curvature :--
1) of the convex lens
The image will be of same size, real and inverted.
2) of the Concave lens
The image will be between focus and the pole and it will be diminished upright and virtual of the lens.
3) of the convex mirror
The image will be between the focus and centre of the curvature and it will be diminished, upright and virtual.
4) of the concave mirror
The image will be real, inverted and of the same size.
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