2018年七年级生物上册2.1.1《练习使用显微镜》课件1(新版)新人教版.ppt

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第一节 练习使用显微镜,显微镜的构造,粗准焦螺旋,细准焦螺旋,镜臂,压片夹,载物台,目镜,镜筒,转换器,物镜,通光孔,遮光器,反光镜,镜座,1,2,3,4,5,6,7,8,9,10,11,12,13,物镜(有螺纹),目镜(无螺纹),目镜放大倍数越大,镜头越 (长或短),物镜放大倍数越大,镜头越 (长或短),短,长,放大倍数与镜头成反比,放大倍数与镜头成正比,观察一下:,观察的标本放大了多少倍 ?,显微镜的放大倍数=物镜放大倍数目镜的放大倍数,反光镜,平面镜(光线较强时使用) 凹面镜(光线较弱时使用),对光,白亮视野,自己操作完成下列任务:,1.先将玻片“e”正放在载物台上,然后观察你看到的物象是否与放置位置相同。,注意:先用10 目镜,4 物镜观察,显微镜中成的像是倒像,2.尝试将玻片向左移动,物象向哪个方向移动?再将玻片向上移动,物象向哪个方向移动?,显微镜中物像移动的方向与标本的移动方向是相反的,3.目镜不变,将物镜转换到10 再次观察,你看到的范围变大了还是变小了?,放大倍数越大,所看到的范围越小,所看到的物体越大。,总结表格,暗,少,细,短,短,

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