Optical Instruments (id: 210f086a2)

本题目来源于试卷: Optical Instruments，类别为 IB物理学

[填空题]
A magnifier is rated s4dtk b(*0 wtzat u(q:b3gykpo y8/),pm( gx aef$2.5\times$for a normal eye focusing on an image at the near point.
(a) What is its focal length?    cm
(b) What is its focal length if the $2.5\times$ refers to a relaxed eye?    cm

参考答案:
空格1: 17±2%  空格2: 10±2% 


本题详细解析:

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