折射透镜

With used Newton s image formula of spherical refraction and the optical spacing term, the formula about cardinal point and image of the thick lens is derived with simpler and more natural way.

利用折射球面成象的牛顿公式及光学间隔概念，更加简洁地得出了有关厚透镜成象的基点及物象公式。

The influence of KTP's thermal effect was controlled and the efficiency of the frequency doubling increased. The steady working of KTP crystal in high power level was realized. 3. A traditional plano-concave cavity was used.

采用传统平凹腔，分析了高泵浦功率下Nd：YAG棒热透镜效应和热致双折射效应的影响，得到了高功率激光器运行在第Ⅱ稳区并且基模体积受到限制的结论。

The reflecting telescope, pioneered by Isaac Newton in the 17th century, later became the instrument of choice because of its use of mirrors, which could be constructed successfully at much great sizes than the glass lenses used in refracting telescopes.

反射望远镜是艾萨克·牛顿于17世纪首先倡导的，后来由于望远镜上反射镜的应用面成为了一种首选的设备，比起折射望远镜里使用的玻璃透镜来，它能够成功建造出尺寸大得多的望远镜。

The lens is made of cell-shaped plastic which has the beautiful retractile effect.

采用蜂窝状塑胶做透镜，其表面花纹达到优美的折射效果。

Further, the difference of negative refraction associated with uniaxial crystal and with negative index media is discussed.

同时还发现单轴晶体中的能流负折射现象不能实现Pendry在理论上所预言的完美透镜。

Photographer's Comments:... there is no Photoshop work on this picture beside recrop. I used a combination of daylight, flash and +4 close up lens to acheive this one. The extra colors are from the bowl I used to receive the droplet. It is an Italian Pasta Bowl with plenty of colors.

作者评议：除了剪切外没有用PS加工，我采用了日光、闪光以及+4 的近距离透镜获得了这幅照片，其他的色彩是从盛水的碗中折射出的，这是有各种颜色的意大利面食碗。

Photographer's Comments there is no Photoshop work on this picture beside recrop. I used a combination of daylight, flash and +4 close up lens to acheive this one.

作者评议：除了剪切外没有用PS加工，我采用了日光，闪光以及+4的近距离透镜获得了这幅照片，其他的色彩是从盛水的碗中折射出的，这是有各种颜色的意大利面食碗。。。。

There is no Photoshop work on this picture beside recrop. I used a combination of daylight, flash and +4 close up lens to acheive this one. The extra colors are from the bowl I used to receive the droplet. It is an Italian Pasta Bowl with plenty of colors. Since I'm a freak of colors, I want to know others opinion.

作者评议：除了剪切外没有用PS加工，我采用了日光，闪光以及+4的近距离透镜获得了这幅照片，其他的色彩是从盛水的碗中折射出的，这是有各种颜色的意大利面食碗，。。。。

There is no Photoshop work on this picture beside recrop. I used a combination of daylight, flash and +4 close up lens to acheive this one. The extra colors are from the bowl I used to receive the droplet. It is an Italian Pasta Bowl with plenty of colors.

作者评议：除了剪切外没有用PS加工，我采用了日光，闪光以及+4的近距离透镜获得了这幅照片，其他的色彩是从盛水的碗中折射出的，这是有各种颜色的意大利面食碗，。。。。

Hotographer's Comments ..............., there is no Photoshop work on this picture beside recrop. I used a combination of daylight, flash and +4 close up lens to achieve this one. The extra colors are from the bowl I used to receive the droplet. It is an Italian Pasta Bowl with plenty of colors. Since I'm a freak of colors, I want to know others opinion.

S： Please， if you like it， vote for it…THX 作者评议：除了剪切外没有用PS加工，我采用了日光，闪光以及+4的近距离透镜获得了这幅照片，其他的色彩是从盛水的碗中折射出的，这是有各种颜色的意大利面食碗，。。。。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷