| 释义 |
虚像xūxiàng物体发出的光线经凹面镜、凸透镜反射或折射后,如为发散光线,它们的反向延长线相交时所形成的影像,叫做虚像。虚像不能显现在屏幕上,不能使照相底片感光。光源在主焦点以内时才能产生虚像,在放大镜、显微镜等中看到的像都是虚像。{virtual image; optical image formed by the crossing of the reverse extension lines of the divergent light rays, namely, the light rays of the objects that are reflected or refracted through the concave lens and convex lens. The virtual image cannot appear on the screen or be sensitized on the film; it can be produced only when the light source is within the main focus. What are seen in the magnifying glass, microscope, etc. are virtual images.} |