F : Focal Point
Focal Length f : Distance of the surface of the mirror O to the foval point F.
The reflecting surface of a concave mirror bows away from the light source like a cavity. This means that the center C of the sphere forming the mirror is in front of the mirror. The focal length f is positive for concave mirrors.
The images in a concave mirror can be found by ray tracing .
Concave mirrors can be found in flashlights .
Concave mirros can produce real images as well as virtual images.
A convex mirror is a mirror that bulges toward the light source. Light rays are illustrating the ray rules for rays incident on a convex spherical mirror.
Ray tracing shows that the image in a convex mirror is a virtual image : no light actually comes from it. It is also erect and closer to the mirror and smaller than the object.
f | : | focal length --> f = R/2 |
R | : | radius of mirror |
---|---|---|
D 0 | : | distance of object |
D i | : | distance of image |
M | : | magnification |
M = -D i / D o
and determines the image characteristics
M.C. Escher: Stilleben mit spiegelnder Kugel, 1934 M.C. Escher: Die Pfuetze, 1952
A cylindrical anamorph needs a cylindrical mirror to be reconstructed.
23 Amazing Anamorphic Artwork that need a mirror cylinder to reveal their beauty.
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