请问显微镜经过两个透镜组后最终成的像是倒立正立,放大缩小,虚还是实的;那么望远镜呢?
推荐回答(3个)
显微镜镜筒的两端各有一组透镜,每组透镜的作用相当于一个凸透镜,人眼通过显微镜观察微小物体时,看到的是放大的虚像(选填“虚”或“实”).
考点:透镜及分类;眼睛及其视物原理.
分析:
(1)显微镜有两组透镜.一组是靠近物体的物镜,相当一个投影仪,成倒立的放大的实像;一组是靠近眼睛的目镜,相当于一个放大镜,刚才倒立的放大的实像成在目镜的焦点以内,使像再次成正立的放大的虚像.
(2)投影仪和放大镜是凸透镜成像的具体应用.
解答:解:显微镜有两组透镜.一组是相当一个投影仪,成倒立的放大的实像;
一组是相当于一个放大镜,成正立的放大的虚像.
投影仪和放大镜是凸透镜成像的具体应用.
我们眼睛看到的放大镜成正立的放大的虚像.
故答案为:凸;虚
望远镜
1. 倍率 透过天文望远镜看地上的风景或月亮, 物体好像变的好近了,同时,也可以看见月亮表面许许多多的坑洞, 这是因为望远镜有放大的功能。 望远镜的倍率是如何计算的呢?倍率是由物镜的焦距除以目镜的焦距。 目镜的焦距 在倍率的计算中, 通常物镜的焦距是固定的, 而变换不同的目镜, 就可以使用多种不同的倍率观测星星季节. 放大倍率越大, 看到的范围就越小。 2.集光力 望远镜的另外一个重要的性能是集光力。集光力是表示望远镜收集光线的能力。 聚光能力的大小, 是由天文望远镜的口径大小来决定, 口俓越大, 集光能力就越强, 可以看到更暗的星星。 3. 解析力 解析力是分辨物体清楚与否的能力, 它跟口径大小有关. 望远镜的 discovery性的秘密口径越大, 解析力就越好。 4. 极限星等 星等越大, 代表星星越暗, 一台天文望远镜能看到多暗的星星是有一定的限制, 所以每台天文望远镜, 都有这大自然一台望远镜的极限星等。譬如说, 一台望远镜只能看到13等的星星, 它就看不到15等的星星。 5.物镜 物镜直径越大,就能看到更暗的星等,小直径的物镜适合观测行星,对于不同的星体需采用不同口径的天文望远镜
我给你简单地说说吧,显微镜的物镜将物体成一个倒立放大的实像,这个倒立的实像位于目镜的物方焦平面上或者之后很靠近的地方。然后这个实像再被目镜成一个放大的虚像于无穷远或者明视距离处。目镜的作用就相当于一个放大镜。显微镜的总倍率=物镜的放大倍率*目镜的放大倍率。
物镜放大率=-光学筒长/f物',目镜放大率=250/f目'
光学筒长就是指物镜的像方焦点到目镜的物方焦点的距离;250是指明视距离;
显微镜实际上就是一结构复杂的放大镜,是对视角的放大。原先一个很细小的东西,我们人眼不能分辨,是因为它对眼睛的张角太小。显微镜(包括放大镜、望远镜)的作用就是将这个张角放大,这样人眼就能分辨了。
显微镜一般是成的倒立的放大的虚像,而望远镜一般都有转像系统,成立的是正立放大的虚像。
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