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(C) When an object is placed between the principal focus $(F)$ and the centre of curvature $(C)$ of a concave mirror,the image formed is real,inverted

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barrel shape

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(C) When an object is placed between the principal focus $(F)$ and the centre of curvature $(C)$ of a concave mirror,the image formed is real,inverted,and magnified.Since the magnification $(m)$ of a concave mirror depends on the distance of the object from the mirror,different parts of the dice are at different distances from the mirror.The part of the dice closer to the focus $(F)$ will have a larger magnification compared to the part closer to the centre of curvature $(C)$.Because the magnification varies along the axis,the edges of the dice parallel to the principal axis will be magnified differently,resulting in a shape that is wider at one end and narrower at the other,resembling a barrel shape.

$A$ dice is placed with one of its edges parallel to the principal axis between the principal focus $(F)$ and the centre of curvature $(C)$ of a concave mirror. Then the final image has the shape of

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