作者handsomeniu (Das Parfum)
看板Physics
标题[问题] 透镜光学问题
时间Wed Jun 4 21:04:18 2008
9 A certain lensometer manufactured to have a standard lens of +20.00D was
accidentally fitted with a +25.00D standard lens. With the target in focus,
the wheel was adjusted to read zero power when no lens was before the stop,
if a +12.50-D lens is placed before the lens stop ,what will be the reading
on the wheel with the target again in focus?
我解释一下lensometer是什麽东西...
lensometer是镜片验度仪，是个可以检测镜片度数的仪器，常见於眼镜店
这个题目的意思是说，原本验度仪的标准中和镜片是+20.00D，现在换成一个+25.00D的，
现在已做好归零的设定，也没有任何的镜片在上面。 现在有一片+12.50D的镜片被放在上
面，此镜片的读数会变成多少?
解答是写+9.14D，但是我求不出此解
有请版上高手解答 感恩
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※ 编辑: handsomeniu 来自: 122.118.17.248 (06/04 21:22)