物理光学问题 急

（1）Two converging lenses, each of focal length 8.3 cm, are separated by 35.8 cm. An object is 15.6 cm to the left of the first lens. Find the position of the final image (relative to the second lens) using both a ray diagram and the thin-lens equation. (Give your answer in cm.)

（2）What is the overall lateral magnification?

中间小数精确度好像影响很大。。。晚点重新算下

（1）s0=fs/(s-f)

f=8.3,s=15.6

s1=17.74

s'=35.8-17.74=18.06

s2=15.36

s总=66.76

（2）2

（1）是15.36~~~相对位置弄错了，离物体66.76，离第2个透镜15.36

晕，怎么都是英语的啊？能翻译过来麻？把关键词翻译过来也行啊……词汇量不够……