[单选题]
A magnifying lens has a rt; 0:g9dh8/xvp qtlk focal length od5ne e1v yj(e44zfi 5l c.g*nif 10 cm. A person has a near point of 25 cm. What is the magnification of the lens foreiy4zf (gdv4nine5el 15*cj. that person when their eyes are focused at their near point?
Post time 2024-1-26 22:03:25