Ghost panorama using a convex mirror

2021 ◽  
Author(s):  
Zhiyuan Ye ◽  
Hai-Bo Wang ◽  
Jun Xiong ◽  
Kaige Wang
Keyword(s):  
Convex Mirror

The Poet As Painter :, A Study In John Ashbery's "Self-Portrait In A Convex Mirror

2017 ◽  
pp. 31
Author(s):  
Qasim Salman Serhan ◽  
Muhanned Agel Hadi
Keyword(s):  
Convex Mirror

Introduction

2017 ◽  
Author(s):  
Jerome Boyd Maunsell
Keyword(s):  
Truth Telling ◽  
Thin Line ◽  
Convex Mirror ◽  
The Way

This chapter traces and opens up the themes that recur in the series of chapters which follow. With a brief discussion of a painting mentioned by Vasari in his Lives of the Painters—Parmigianino’s Self-Portrait in a Convex Mirror (1523–4)—ideas of illusion and truth-telling, the differences between visual and literary self-portraiture, and the difficulties in searching for the meaning of a life, are introduced. The scope of Portraits from Life is outlined, with brief definitions of memoir and autobiography, and a discussion of the thin line between fiction and autobiography in all writing. The key problems, satisfactions, and possibilities of biography and autobiography are raised, especially as they relate to the Modernist period and to writers who are also novelists. The way in which autobiography often becomes a form of group portraiture is also discussed.

scholarly journals Implementation of the PIMCA model to learning convex mirror

2021 ◽  
Vol 1968 (1) ◽  
pp. 012040
Author(s):  
S Reskin ◽  
P M Silangen ◽  
J V Tumangkeng ◽  
C Poluakan ◽  
T K Londa ◽  
...  
Keyword(s):  
Convex Mirror

scholarly journals On a cassegrain reflector with corrected field

1913 ◽  
Vol 88 (602) ◽  
pp. 188-191
Keyword(s):  
Spherical Aberration ◽  
Focal Length ◽  
Straightforward Manner ◽  
Flat Field ◽  
Convex Mirror ◽  
Solution Proceeds ◽  
Characteristic Features ◽  
Working Out ◽  
Essential Problem ◽  
Single Focus

The purpose of this memoir is to discover an optical appliance which shall correct in a practical manner the faults in the field of a Cassegrain reflector, while leaving unimpaired its achromatism and the characteristic features of its design, which gives a focal length much greater than the length of the instrument, combined with a convenient position of the observer. The question touches an investigation by Schwarzschild as to what can be done with two curved mirrors the figures of which are not necessarily spherical. With these be corrects spherical aberration and coma, but in order to secure a flat field he is led to a construction in which the second mirror, which is between the great mirror and its principal focus, is concave, and therefore shortens the effective focal length, in place of increasing it. The deformations from spherical figures are also so great, especially for the great mirror, as to leave it doubtful whether the construction discussed could ever be the model for practicable instruments. If we keep to the Cassegrain form, spherical aberration and coma may equally be corrected by deformations of the mirrors which through large, are less extreme, but there remains a pronounced curvature of the field. For this reason I am led, in the present memoir, to consider more complicated systems produced by the interposition of systems of lenses, achromatism can be preserved completely for a single focus if there are three lenses of focal length determined when their position are given, and if all are made of the same glass. One of these lenses, which I call the reverser, is silvered at the back and replaces the convex mirror; the other two are placed close together in the way of the outcoming beam, about one third of the distance from the great mirror to the reverser; the members of this pair, which I call the corrector, are of nearly equal but opposite focal lengths, introducing very little deviation in the ray but an arbitrary amount of aberration, according to the distribution of curvatures between the two faces of each lens. All the surfaces are supposed spherical except that of the great mirror, The essential problem is to bring the necessary work into a form that will allow unknown quantities which express the distribution of curvature between the faces of each lens to be carried forward algebraically. The methods employed are those of a recent memoir by the author,* and a part of the paper is occupied in working out expressions to which this theory leads, for thin lenses, systems of thin lenses, mirrors, reversers and the like, and it may be regarded as an expansion and working illustration of that memoir. Ibis part does not lend itself to summary, When the expressions are obtained the solution proceeds in a straightforward manner, by approximation, which is somewhat complicated owing to the number of considerations which it is necessary to keep in view, but is not otherwise difficult. The solution is completed at the stage where the unextinguished aberrations are considered negligible.

A Structure Nondestructive Evaluation Using Laser-Generated Ultrasonic Application

2004 ◽  
Vol 261-263 ◽  
pp. 1367-1372
Author(s):  
Jae Yeol Kim ◽  
S.U. Yoon ◽  
Kyeung Cheun Jang ◽  
Myung Soo Ko ◽  
Jae Sin An
Keyword(s):  
Light Beam ◽  
Laser Frequency ◽  
Test Material ◽  
Time Shift ◽  
Ultrasonic Signals ◽  
Fabry Perot ◽  
Convex Mirror ◽  
Type Size ◽  
Pulse Type ◽  
Stable Frequency

In the present study, a Nd;YAG Laser (pulse type) was used to emit ultrasonic signals to a test material. In addition, a total ultrasonic investigation system was designed by adopting a Fabry-Perot interferometer, which receives ultrasonic signals without any contact. For non-destructive test SM45C, which contains some flaws was used as a test material. Because it is easy to align light beam in receiver, and the length of the light beam does not change much even if convex mirror leans towards one side, confocal Fabry-Perot interferometer, which has stable frequency, and PI control are used to correct interfered and unstable signals from temperature, fluctuation and time shift of laser frequency. Stable signals are always obtained by the feedback of PI circuit signals in the confocal Fabry-Perot interferometer. The type, size and position of flaws inside the test material were examined by achieving the stabilization of an interferometer. This study presented a useful method, which could quantitatively investigate the fault of objects by using a Fabry-Perot interferometer.

Study on the method to test large-aperture hyperboloid convex mirror

2014 ◽  
Author(s):  
Xiaohui Meng ◽  
Huiwen Dong ◽  
Wen Guo ◽  
Huijun Wang
Keyword(s):  
Large Aperture ◽  
Convex Mirror

Gargantua in a Convex Mirror: Fischart's View of Rabelais.

1987 ◽  
Vol 18 (4) ◽  
pp. 599
Author(s):  
Edward Benson ◽  
Florence M. Weinberg
Keyword(s):  
Convex Mirror
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