[填空题]
A person’s right eye can see objects clearly obl.h6 c3 l1fgr xxl9,qnly if they a1-p a chiczsues4)5,g3r2pr ire between 25 $cm$ and 75 $cm$ away.
(a) What power of contact lens is required so that objects far away are sharp? - D
(b) What will be the near point with the lens in place? cm
