[单选题]
The near point of a p2e.y8o / er1cs/gyllfarnp0w)e bk/ ;dykw *x /dz*m7pdsighted person is 100 cm. She places reading glasses close to her eyes, and witw/b* kyz;p*e0d 7p d kn)m/wxdh them she can comfortably read a newspaper at a distance of 25 cm. What lens power is required?
