Compound Microscope

复式显微镜

A compound microscope uses a very short focal length objective lens to form a greatly enlarged image. This image is then viewed with a short focal length eyepiece used as a simple magnifier. The image should be formed at infinity to minimize eyestrain.

复合显微镜使用一个非常短焦距的物镜来形成一个显著放大的像。这个像然后通过一个短焦距的目镜作为简单的放大镜来观察。为了最小化眼睛疲劳，像应形成于无穷远处。

The general assumption is that the length of the tube L is large compared to either f_o or f_e so that the following relationships hold.

通常假设管长L远大于fo或fe，因此以下关系式成立。

In a working microscope, the length L in the sketch above is much longer than either of the lens focal lengths f_o and f_e.

在工作显微镜中，图中所示的长度L远大于透镜的焦距f₀和fₑ。

Example

示例

Linear and angular magnification

线性与角放大率

Index

Lens concepts

Optical instruments

索引透镜概念光学仪器

HyperPhysics***** Light and Vision

HyperPhysics ***** 光与视觉

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Microscope Example

显微镜示例

The general assumption is that the length of the tube L is large compared to either f(o) or f(e) so that the following relationships hold.

通常假设管长L远大于f(o)或f(e)，因此以下关系式成立。

For tube length L = cm,

对于管长 L = 厘米，

中文译文中的待填/计算数值依次对应：1：L。实际数值以上方原输入框为准。

objective focal length f_o = mm

目标焦距 f_o = mm

中文译文中的待填/计算数值依次对应：1：fo。实际数值以上方原输入框为准。

and eyepiece focal length f_e = mm

和目镜焦距 f_e = mm

中文译文中的待填/计算数值依次对应：1：fe。实际数值以上方原输入框为准。

then the magnification can be approximated as follows:

然后放大率可以近似表示为以下形式：

Linear magnification of objective
= m_o =

物镜的线性放大率 m o =

中文译文中的待填/计算数值依次对应：1：mo。实际数值以上方原输入框为准。

Angular magnification of eyepiece
= M_e =

目镜的角放大率 = M_e =

中文译文中的待填/计算数值依次对应：1：me。实际数值以上方原输入框为准。

Total magnification = M =

总放大率 = M =

中文译文中的待填/计算数值依次对应：1：mic。实际数值以上方原输入框为准。

The tube length and the objective and eyepiece focal lengths may be changed. This calculation is the standard form which is usually quoted for microscopes, but it is an approximation which may not be a good one under certain circumstances.

管长以及物镜和目镜的焦距可能被改变。这个计算是标准形式，通常用于显微镜，但它是一个近似值，在某些情况下可能并不准确。