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When a parallel beam of light from a far off object falls on a concave mirror, a real, inverted point size image is formed at the point called focus. These rays are assumed to be paraxial, i.e. when incident at points close to the pole of the mirror they do make smaller angles with the principal axis. The rays reflected converge at a focal point on the principal axis.
These rays need to form a concave mirror image
1.The reflected ray passes through the focal point of the mirror.
2. The ray passing through the centre of the curvature of the mirror.
3. The ray passing through(or directed) the focus of a concave mirror.
4. The ray incident at the angle at a pole. The reflected ray applies for laws of reflection.
Note: Concave mirrors appears inverted because the object distance here will be greater than the focal length of the mirror.
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