Lens (optics)

where M is the magnification factor defined as the ratio of the size of an image compared to the size of the object. The sign convention here dictates that if M is negative, as it is for real images, the image is upside-down with respect to the object. For virtual images M is positive, so the image is upright.

单词	Plus lens
释义	Plus lens 英语例句库 Objective To study the heterophoria and effect of plus lens on it in juvenile myopes. 目的研究青少年近视眼的隐斜和正透镜对隐斜的影响。英语百科 Lens (optics) where M is the magnification factor defined as the ratio of the size of an image compared to the size of the object. The sign convention here dictates that if M is negative, as it is for real images, the image is upside-down with respect to the object. For virtual images M is positive, so the image is upright.
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Plus lens

Lens (optics)