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A curved mirror is a mirror with a curved reflecting surface. The surface may be either convex (bulging outward) or concave (recessed inward). Most curved mirrors have surfaces that are shaped like part of a sphere, but other shapes are sometimes used in optical devices. The most common non-spherical type are parabolic reflectors, found in ...
The 1983 Minolta Disc-7 camera had a convex mirror on its front to allow the composition of self-portraits, and its packaging showed the camera mounted on a stick while used for such a purpose. [9] A "telescopic extender" for compact handheld cameras was patented by Ueda Hiroshi and Mima Yujiro in 1983, [ 10 ] and a Japanese selfie stick was ...
Focal length. The focal point F and focal length f of a positive (convex) lens, a negative (concave) lens, a concave mirror, and a convex mirror. The focal length of an optical system is a measure of how strongly the system converges or diverges light; it is the inverse of the system's optical power. A positive focal length indicates that a ...
In optics, an image is defined as the collection of focus points of light rays coming from an object. A real image is the collection of focus points actually made by converging/diverging rays, while a virtual image is the collection of focus points made by extensions of diverging or converging rays. In other words, a real image is an image ...
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The image in a plane mirror is not magnified (that is, the image is the same size as the object) and appears to be as far behind the mirror as the object is in front of the mirror. A diverging lens (one that is thicker at the edges than the middle) or a convex mirror forms a virtual image. Such an image is reduced in size when compared to the ...
The first mirrors used were convex, introducing deformations that the artist sometimes preserved. A painting by Parmigianino in 1524 Self-portrait in a mirror , demonstrates the phenomenon. Mirrors permit surprising compositions like the Triple self-portrait by Johannes Gumpp (1646), or more recently that of Salvador Dalí shown from the back ...
Oil on convex panel. Dimensions. 24.4 cm diameter (9.6 in) Location. Kunsthistorisches Museum. Self-portrait in a Convex Mirror (c. 1524) is a painting by the Italian late Renaissance artist Parmigianino. It is housed in the Kunsthistorisches Museum, Vienna, Austria.