查询词典 convex

Large convex lens produces image that is viewed through the eyepiece .

通过目镜观察物体图像的大的凸透镜。

As shown, a thin convex lens with focus length 10 cm and a concave

如上图所示，一焦距为10 cm的薄凸透镜和一半径为20 cm的凹球面反射镜共轴。P点球心

Pictures at the bottom are beyond the focus of the convex lens.

九龙杯：在杯子里有一个凸透镜，杯子底部的图像位于凸透镜的焦点以外。

Image of a bulb is formed on the screen by a convex lens.

把透镜稍为移向灯箱，要影像重新形成在屏幕上，下列哪些叙述是正确的

Notice that this lens is actually different than the plano convex lens used in the original Galilean telescope, but still gives the same results.

请注意，这个镜头实际上是平凸比在原来的伽利略望远镜所使用的镜头不同，但仍给了相同的结果。

A convex lens is used to concentrate rays of light.

凸透镜用于聚集光线。不适合

Long-sightedness can be corrected with a convex lens that ensures light rays fall on the retina and focus accurately.

长期近视可以纠正一个凸透镜，确保光线落在视网膜和重点，准确。

A single convex lens is used to produce an enlarged image.

能够产生放大图像的单个凸透镜。

He pointed out that such a combination would produce an inverted image but showed that the addition of yet a third convex lens would make the image erect again.

他指出，这样的组合会产生一倒的形象，但表明，增补，但第三个凸透镜，将使形象再次竖立。

It is possible that in the 1570s Leonard and Thomas Digges in England actually made an instrument consisting of a convex lens and a mirror, but if this proves to be the case, it was an experimental setup that was never translated into a mass-produced device.

这是有可能，在1570年代伦纳德和托马斯digges在英格兰实际上是一种手段构成的一个凸透镜和一面镜子，但如果这证明是如此，这是一个实验装置，这是从来没有转化为大规模生产装置

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。