Bilingual edition: English is preserved and Chinese follows each unit. Terminology uses the confirmed v20260916 glossary; automated semantic review remains traceable.
中英双语版：英文原文完整保留，中文紧随对应单元；术语采用 v20260916 确认表，自动语义审校结果可追溯。

Virtual Image Formation

虚像形成

Diverging lenses form reduced, erect, virtual images. Using the common form of the lens equation, f, P and i are negative quantities.

发散透镜形成缩小、正立的虚像。使用透镜方程的常用形式，f、P和i都是负量。
Enter data below, then click on the quantity you wish to calculate in the active formula above.
For a lens of focal length f = cm,
corresponding to lens power P = diopters,
an object distance of o = cm
will produce an image at i = cm.
The linear magnification will be M = .

If a negative focal length is entered to agree with the illustration, then the image is a virtual image on the same side of the lens as the object and will give a negative image distance. If a calculation yields a positive focal length, then the lens is a converging lens rather than the diverging lens in the illustration. The lens equation can be used to calculate the image distance for either real or virtual images and for either positive on negative lenses. The linear magnification relationship allows you to predict the size of the image.

如果输入负的焦距以符合示意图，则图像将是一个虚像，位于透镜与物体同侧，并会给出负的像距。如果计算结果得到正的焦距，则透镜是一个会聚透镜，而不是示意图中的发散透镜。透镜方程可用于计算实像或虚像的像距，以及正或负的透镜。线性放大率关系允许你预测像的大小。
Other ways to form virtual images
形成虚像的其他方法
在下方输入数据，然后点击上方交互式公式中您希望计算的量。对于焦距 f = 厘米的透镜，对应透镜功率 P = 度，物距 o = 厘米将产生像距 i = 厘米。线性放大率将为 M = 。
中文译文中的待填/计算数值依次对应：1：f 2：p 3：o 4：i 5：m。实际数值以上方原输入框为准。
 Index

Lens concepts
棱镜概念索引
 
HyperPhysics***** Light and Vision
HyperPhysics ***** 光与视觉
R Nave
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