State where an object must be placed so that the image formed by a concave mirror is:(a) erect and virtual.(b) at infinity.(c) the same size as the object.
(a) For the image formed by a concave mirror to be erect and virtual, the object must be placed between the pole $(P)$ and the focus $(F)$ of the mirror.
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(b) For the image formed by a concave mirror to be at infinity, the object must be placed at the focus $(F)$ of the mirror.
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(c) For the image formed by a concave mirror to be of the same size as the object, the object must be placed at the centre of curvature $(C)$ of the mirror.
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Explanation
A concave mirror is a mirror that is curved inward in the middle. It is also known as converging mirrors, due to the fact that when parallel incident rays fall on the surface of the mirror, the rays will reflect and meet at a particular point and form the
image.
Depending on the position of the object with respect to the mirror, the types of images it forms are real, inverted as well as virtual and erect image, also the size of the images formed are magnified, diminished as well as the same size as that of the object.
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