| 1. | I examined three key technical properties of this proposed concave - mirror projector
我检验了凹面镜投射的三项关键技术特性。 |
| 2. | The diameter of a sphere is four times the focal length of a concave mirror cut from it
凹面镜如果是从圆球上切下来的，圆球的直径会是凹面镜焦距的四倍。 |
| 3. | The ancient greeks used lenses or concave mirrors to concentrate the sun ' s rays and burning glasses were also used by mexican aztecs and the chinese
古希腊人使用透镜或凹面镜聚集太阳光线并且这种方法也被墨西哥阿芝台克和中国人使用。 |
| 4. | Unlike concave mirrors , the convex kind produces right - side - up virtual images , smaller than the original object , which cannot be projected onto a canvas
与凹面镜相反，凸面镜呈现的虚像不会颠倒，影像比原来的物体要小，且无法投射到画布上。 |
| 5. | Renaissance craftsmen , moreover , would have faced severe technical challenges in silvering and sealing a concave mirror , which required the application of hot tar and pitch on the outside of the glass
文艺复兴时代的工匠在涂银与装置凹面镜时，还要面对更多艰难的技术挑战，那需要在玻璃表面施予滚烫的焦油与沥青。 |
| 6. | To my knowledge , no such concave mirrors made by reversing a glass sphere survive in museum collections , and no contemporary documentary evidence indicates that anyone made concave mirrors by reversing blown glass spheres
据我所知，目前博物馆里，没有任何利用玻璃球内面制造的凹面镜，也没有任何那个时代的文件证据指出，有人制造过利用玻璃球内面做成的凹面镜。 |
| 7. | The interferometric zone plate is the essential of hoes , which is the interference between plane wave and sphere wave , can focus the light beam by diffraction , instead of the way which conventional lens or concave mirrors do
摘要干涉式波带板系由平面波和球面波两道光波干涉而成，为研究全像光学元件的基础，其可经由绕射作用达到聚焦效果，犹如使用传统凸透镜或凹面镜所产生的效果。 |
| 8. | For a number of historical and technical reasons , hockney envisions a camera obscura based not on a lens but on a concave mirror ( curved inward like a shaving or makeup mirror ) , which can also project an image onto a screen
由于历史与技术上的若干理由，霍克尼推想出一种不采用透镜、却利用凹面镜的暗箱（凹面镜是一种内凹的镜子，比如刮胡子或化妆时用的镜子） ，这种镜子也可以把影像投射到屏幕上。 |
| 9. | The laws of geometric perspective guarantee that in a concave - mirror projection of a symmetric chandelier onto van eyck ' s support all parallel lines would meet at a vanishing point , just as the image of train track rails meet on the horizon in a photograph
几何透视定理保证，形状对称工整的吊灯经过凹面镜投射到范艾克的屏台时，所有平行线会在消逝点上交会，就好像照片上的火车铁轨会在地平线上交会。 |
| 10. | A concave mirror reflects parallel light rays so that they meet at the so - called focal point . ( if you try to use such a mirror to start a fire in sunlight , you place the tinder at the focal point . ) the distance from the mirror to the focal point is its focal length
凹面镜反射平行光，让光线汇聚到所谓的焦点（如果你想用这种镜子在日光下起火，就要把易燃物放在焦点上） ，从镜面到焦点的距离就是焦距。 |
