# 电子工程代写|虚拟现实代写Virtual Reality代考|MDDN222

## 电子工程代写|虚拟现实代写Virtual Reality代考|Background Information

In 1696 , in a description of the collections in the Royal Danish Copenhagen Kunstkammer, Holger Jacobsen also describes, among other things, the “Lucerna magica”([75], p. 67). In a German translation of the Latin text in the “Contributions to Natural History” from 1752 for the entry “….also a magic lantern”, an associated anecdote is reproduced, which perhaps explains Petit’s designation “lantern of fear” ([76], p. 154):
Jacobaeus thinks that the excellent Danish glass artist (opticus), Thomas Walgenstein, has surpassed all others in the production of this [the magic lantern, author’s note]. He showed, shortly before King Frederick the Third ${ }^{29}$.s death, among others, the image of death through it; all others were frightened, but the king punished their fearfulness, said he could not see this image often enough, and ordered it to be shown more than once.
Another design comes from Huygens himself, who explains the placement of the lenses and the concave mirror in a letter on December 11,1664 to Petit, ([77], p. 162). Even if the sketch in Fig. $3.27$ does not appear particularly impressive at first glance, we are dealing here in principle with the construction of a projector still in use today. The labels and the position of the slide (in red) have been added for explanatory purposes only. There is no labeling in the original. In the intertwined beam path, the light source (here a candle) is located in front of a concave mirror (reflector), ideally at its focal point. This reflector serves to redirect the light emitted by the candle in the opposite direction to the projection direction, which would otherwise be wasted, back into the correct direction. With this “light recycling” Huygens obtains almost twice the brightness. An illuminating lens (condenser) is placed in front of the light source. Again, the light source should be near the focal point of the condenser. The film stage for the translucent object to be imaged is attached to the flat surface of the condenser. Through this arrangement, this object (slide) is illuminated by an almost parallel beam of light. Finally, the slide is imaged onto the projection screen via the imaging lens (today usually a lens), whereby the object must be located in the object distance and the projection screen in the image distance according to the lens equation.

## 电子工程代写|虚拟现实代写Virtual Reality代考|Projection with Solar Power

With the increasing spread of the “fright lantern” towards the end of the seventeenth century, scholars tried to use the now well-known physical effect of magnifying an object beneficially for science. The idea of a projection microscope can be assumed to have been obvious to those who had knowledge of the function of a microscope, the camera obscura and the magic lantern at the same time.

Until then, a serious problem of large image projection by means of a candle was the low brightness. The solar microscope now used the radiant power of the sun as illumination and thus produced an incomparably brighter image. Due to the distance of the sun, the sun’s rays hit the earth almost parallel. With solar illumination, therefore, one saves not only the rear collecting mirror, but also the condenser lens, and thus obtains an extremely simple instrument for microscopic observation.

The first description of such a device is sometimes considered to be Theodor Balthasar. In 1710 , Balthasar compares the projection of an object onto a paper with the image in a magic lantern (in [93], p. 119). The part-time microscopist Ledermüller ${ }^{32}$ defends in his book “Versuch zu einer gründlichen Verteidigung derer Saamenthiergen ” (“Attempt at a thorough defense of the spermatozoon”) from 1758 [96] not only the “the dignified life of the seed worms”, but also proclaims Balthasar as the true inventor of the solar microscope.
At this time, the solar microscope was generally associated with the name Lieberkühn.

## 电子工程代写|虚拟现实代写Virtual Reality代考|Background Information

1696 年，在对丹麦皇家哥本哈根艺术博物馆馆藏的描述中，Holger Jacobsen 还描述了“Lucerna magica”（[75]，第 67 页）。在 1752 年“对自然历史的贡献”中的拉丁文本的德语翻译中，条目“……也是一个魔法灯笼”，复制了一个相关的轶事，这也许可以解释佩蒂特的名称“恐惧的灯笼”（[76] , p. 154)：
Jacobaeus 认为优秀的丹麦玻璃艺术家 (opticus)，Thomas Walgenstein 在制作这件 [魔灯，作者注] 方面已经超越了所有其他人。他在腓特烈三世国王面前不久29.s 死亡，除其他外，通过它的死亡形象；其他人都吓坏了，但国王惩罚了他们的恐惧，说他不能经常看到这个形象，并下令多次展示。

## 电子工程代写|虚拟现实代写Virtual Reality代考|Projection with Solar Power

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