Image formation by a concave mirror:
For a distant point object, the light rays are effectively parallel when they reach the mirror. They are then focused to the principal focus (or focal point), 'F', of the mirror. A real image of the object is formed here. The distance from the mirror to the principal focus is called the focal length, 'f', of the mirror.
For an object beyond the principal focus, an inverted real image is formed by the reflected rays. The position and size of the image depends on the distance from the object to the mirror. The magnification of the image is:
- the image height/the object height
For an object between the focal point and the mirror, the reflected rays form an upright virtual image of the object.
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