文档介绍：眼睛和眼睛教学设计
of rural drinking water sources, protection of drinking water sources in rural areas by the end of thwork protection facilities
板书设计
眼睛和眼镜
一、眼睛: 晶状体和角膜相当于一个凸透镜，视网膜相当于光屏，当物体的像成在视网膜上时，我们就看见物体了。
二、近视眼及其矫正
1．近视眼 ： 晶状体太厚，折光能力太强，眼球前后方向太长
2．矫正方法：凹透镜
三、远视眼及其矫正
1．远视眼： 晶状体太薄，折光能力差，眼球前后方向太短
2．矫正方法:凸透镜
of rural drinking water sources, protection of drinking water sources in rural areas by the end of the delimitation of the scope of protection, complete with warning signs, isolating network protection facilities
of rural drinking water sources, protection of drinking water sources in rural areas by the end of the delimitation of the scope of protection, complete with warning signs, isolating network protection facilities
of rural drinking water sources, protection of drinking water sources in rural areas by the end of the delimitation of the scope of protection, complete with warning signs, isolating network protection facilities
练习题
；当睫状体放松时，晶状体比较_______，远处物体的像落在_______上，眼球可以看清远处的物体。
，远处物体的像落在视网膜______（填“前”或“后”）。而看不清远处的物体。
，近处物体的像落在视网膜______（填“前”或“后”）。而看不清远处的物体。
，对光的偏折能力（ ）
、仔细的测量后，得知自己的近视眼镜片的焦距是40cm，则镜片的度数是（ ）
C.-250度 D.-400度
，爷爷的老花眼更重一些，小明的妈妈则是近视眼。他们