If an object is placed at the focus of a concave mirror, the image will form at [[1]].

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Detailed Solution

If an object is placed at the focus of a concave mirror, the image will form at infinity.
The rays considered here are one parallel to the principal axis and other passing through the centre of curvature of the mirror. This results in the formation of a highly enlarged image which is real and inverted, at infinity.
Question Image

A spherical mirror has the shape of a piece cut out of a spherical surface. There are two types of spherical mirrors: concave mirrors and convex mirrors.
When a ray of light incidents upon a plane mirror, the light ray gets reflected off the mirror. After reflection, there is a change in the direction of the light rays. The convention used to express the direction of a light ray is to indicate the angle that the light ray makes with a normal line drawn to the surface of the mirror.

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