If an object is at infinity (very large distance) in front of a concave mirror, the image will form at the [[1]].

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Detailed Solution

If an object is at infinity (very large distance) in front of a concave mirror, the image will form at the focus.
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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When an object is placed at infinity in front of a concave mirror, the image will form at the focus. When the object is at a very large distance from a concave mirror, the image formed is the focus of the mirror.

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