一道物理题..关于凹凸透镜的A convex mirror produced an image that is 3.0 cm behind the mirror.If the focal length of thismirror is 5.0 cm,at what distance from the mirror is the object placed?
问题描述：
一道物理题..关于凹凸透镜的
A convex mirror produced an image that is 3.0 cm behind the mirror.If the focal length of this
mirror is 5.0 cm,at what distance from the mirror is the object placed?
答
先翻译题目：
一凸面镜在镜后3.0CM处形成一镜像.若凸面镜焦距是5.0CM,则实物与凸面镜距离多远?
根据公式：1/U+1/V=1/F
1/3.0+1/V=1/5.0
V=-7.5CM
实物与凸面镜距离是7.5CM,负号表示实物与镜像不在凸面镜的一侧.