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Strict Standards: Non-static method System_SharedMemory::factory() should not be called statically in /www/wwwroot/maruikeiki.com.cn/maruikeiki/config/common.fun.php on line 42

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Strict Standards: Non-static method System_SharedMemory::factory() should not be called statically in /www/wwwroot/maruikeiki.com.cn/maruikeiki/config/common.fun.php on line 42

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Strict Standards: Non-static method System_SharedMemory::factory() should not be called statically in /www/wwwroot/maruikeiki.com.cn/maruikeiki/config/common.fun.php on line 42

Strict Standards: Non-static method System_SharedMemory::getAvailableTypes() should not be called statically in /www/wwwroot/maruikeiki.com.cn/maruikeiki/web_common5.8/SharedMemory/SharedMemory.php on line 58

Strict Standards: Non-static method System_SharedMemory::factory() should not be called statically in /www/wwwroot/maruikeiki.com.cn/maruikeiki/config/common.fun.php on line 42

Strict Standards: Non-static method System_SharedMemory::getAvailableTypes() should not be called statically in /www/wwwroot/maruikeiki.com.cn/maruikeiki/web_common5.8/SharedMemory/SharedMemory.php on line 58

Strict Standards: Non-static method System_SharedMemory::factory() should not be called statically in /www/wwwroot/maruikeiki.com.cn/maruikeiki/config/common.fun.php on line 42

Strict Standards: Non-static method System_SharedMemory::getAvailableTypes() should not be called statically in /www/wwwroot/maruikeiki.com.cn/maruikeiki/web_common5.8/SharedMemory/SharedMemory.php on line 58

Strict Standards: Non-static method System_SharedMemory::factory() should not be called statically in /www/wwwroot/maruikeiki.com.cn/maruikeiki/config/common.fun.php on line 42

Strict Standards: Non-static method System_SharedMemory::getAvailableTypes() should not be called statically in /www/wwwroot/maruikeiki.com.cn/maruikeiki/web_common5.8/SharedMemory/SharedMemory.php on line 58

Strict Standards: Non-static method System_SharedMemory::factory() should not be called statically in /www/wwwroot/maruikeiki.com.cn/maruikeiki/config/common.fun.php on line 42

Strict Standards: Non-static method System_SharedMemory::getAvailableTypes() should not be called statically in /www/wwwroot/maruikeiki.com.cn/maruikeiki/web_common5.8/SharedMemory/SharedMemory.php on line 58

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日本MARUIKEIKI丸井计器扩大透镜MP的特点-日本MARUIKEIKI
作 者:日本MARUIKEIKI丸井计器扩大透镜MP的特点-日本MARUIKEIKI  发表时间:2013-03-28 15:10:15   浏览次数:

日本MARUIKEIKI丸井计器扩大透镜MP的特点-日本MARUIKEIKI

在光学中,由实际光线汇聚成的像,称为实像,能用光屏承接;反之,则称为虚像,只能由眼睛感觉。有经验的物理老师,在讲述实像和虚像的区别时,往往会提到这样一种区分方法:“实像都是倒立的,而虚像都是正立的。”所谓“正立”和“倒立”,当然是相对于原物体而言。
平面镜、凸面镜和凹透镜所成的三种虚像,都是正立的;而凹面镜和凸透镜所成的实像,以及小孔成像中所成的实像,无一例外都是倒立的。当然,凹面镜和凸透镜也可以成虚像,而它们所成的两种虚像,同样是正立的状态。
那么人类的眼睛所成的像,是实像还是虚像呢?我们知道,人眼的结构相当于一个凸透镜,那么外界物体在视网膜上所成的像,一定是实像。根据上面的经验规律,视网膜上的物像似乎应该是倒立的。可是我们平常看见的任何物体,明明是正立的啊?这个与“经验规律”发生冲突的问题,实际上涉及到大脑皮层的调整作用以及生活经验的影响。
当物体与凸透镜的距离大于透镜的焦距时,物体成倒立的像,当物体从较远处向透镜靠近时,像逐渐变大,像到透镜的距离也逐渐变大;当物体与透镜的距离小于焦距时,物体成放大的像,这个像不是实际折射光线的会聚点,而是它们的反向延长线的交点,用光屏接收不到,是虚像。可与平面镜所成的虚像对比(不能用光屏接收到,只能用眼睛看到)。
当物体与凸透镜的距离大于焦距时,物体成倒立的像,这个像是蜡烛射向凸透镜的光经过凸透镜会聚而成的,是实际光线的会聚点,能用光屏承接,是实像。当物体与透镜的距离小于焦距时,物体成正立的虚像。