Why we can see a inverted image from a convex lens?

We can see an inverted image from a convex lens because of the placement of the object. Following are a few examples in which the object placing varies:
a) When an object is kept at infinity, the image obtained would be highly diminished, real, and inverted.
b) When the object is kept beyond the centre of curvature, the image obtained would be diminished, real, and inverted.
c) When the object is kept at the centre of curvature, the size of the image is simila to that of the object, real, and inverted.
d) When the object is placed between the centre of curvature and principal focus, the image obtained is enlarged, real,and inverted.
e) When the object is placed at the principal focus, the image is enlarged, real, and inveretd.

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