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عبدالله المالكي الإثنين أبريل 06, 2009 10:48 pmMirror Basics
Mirrors work much like lenses, except that they have reflective surfaces. Mirrors can also be convex or concave and there are also plane mirrors, though the converging and diverging properties are applied to the opposite name than the lenses. Every mirror has a focal point, where all the light directed at that mirror converges or diverges and the distance between the mirror and that point is called the focal length. The radius of the curvature of a mirror is exactly twice the focal length. Mirrors can create both real and virtual images, real being images that are actually there, virtual images only being able to be seen by looking into the mirror. Images are also either inverted or erect, upside down or right side up respectively. The focal length is referred to as F and the radius of curvature 2F. The magnification of any mirror can be calculated by subtracting the ratio of the height of the image to the height of the object and the ratio of the distance from the mirror of the image to the distance of the object. If the result is a negative number, then it represents the factor of reduction as opposed to the factor of magnification.
Mirrors work much like lenses, except that they have reflective surfaces. Mirrors can also be convex or concave and there are also plane mirrors, though the converging and diverging properties are applied to the opposite name than the lenses. Every mirror has a focal point, where all the light directed at that mirror converges or diverges and the distance between the mirror and that point is called the focal length. The radius of the curvature of a mirror is exactly twice the focal length. Mirrors can create both real and virtual images, real being images that are actually there, virtual images only being able to be seen by looking into the mirror. Images are also either inverted or erect, upside down or right side up respectively. The focal length is referred to as F and the radius of curvature 2F. The magnification of any mirror can be calculated by subtracting the ratio of the height of the image to the height of the object and the ratio of the distance from the mirror of the image to the distance of the object. If the result is a negative number, then it represents the factor of reduction as opposed to the factor of magnification.
