物体放在焦点之外,在凸透镜另一侧成倒立的实像,实像有缩小、等大、放大三种.物距越小,像距越大,实像越大.物体放在焦点之内,在凸透镜同一侧成正立放大的虚像.物距越小,像距越小,虚像越小要是成清晰实像,需使屏位于F
推荐
猜你喜欢
- There was a big river and tow hills in my hometown ten years ago.
- 诗经采薇表达了什么的思想感情
- clothing made of the man-made fiber has certain advantages over() made of natural fiber like cotton
- 连续的两句含有"杜鹃"的古诗句.
- 若等差数列{an}的公差d≠0，且a1，a3，a7成等比数列，则a1a4=（ ） A.12 B.25 C.2 D.52
- 一元二次方程-已知关于x的方程x^2+px+q=0的两个根式-1和-3,求p和q的值
- About twice a week my driver collects me from school.l go and have lunch with a client
- 十年树木百年树人的意思