| 释义 |
抛物面镜pāowùmiànjìng反射面为抛物面的镜子。光源在焦点上时,光线经镜面反射后变成平行光束。汽车灯、探照灯中装有抛物面镜。{parabolic mirror; mirror whose reflector takes the shape of a paraboloid, so that when the source of light coincides with its focus the reflected light becomes parallel. Parabolic mirror is fixed in automobile headlights and searchlights.} |