物體置於焦距 12 cm 的凸透鏡前 36 cm 處,像距為何?

Answer and explanation

Correct answer: A. 18 cm

  1. Step 1: 透鏡公式:,。
  2. Step 2: cm。
Answer
18 cm.
Why not the others: 9 cm:透鏡公式中符號用錯(用了 );24 cm:把 當成像距;48 cm:把物距加焦距。

Practise more 運動學.

Free questions with an explanation for every one, and full timed GSAT (Taiwan University Entrance) mock tests.