[单选题]
The near point of a farsight9qt(kfgl za 7(ed pe qg b pul)*+c .lswh2ehn2.cz3rson is 100 cm. She places reading glasses close to her eyes, and with them she can comfortably read a newspaper at.c *qcgpuzs 3+ h2.el2n)bwlh a distance of 25 cm. What lens power is required?
Post time 2024-1-26 22:03:25