[問題] 一直搞不清楚的相機問題
我在書上看到一段
說到照相機底片
單位面積所接收光能量I
孔徑平方
正比於 --------
焦距平方
也就是
2
D
I 正比 --------
2
f
我一直無法了解為什麼
請問有人有清楚的圖示嗎?
謝謝~~
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