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主虹と副虹の色の順序について
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主虹と副虹の色の並びが逆に見える「正しい」理由は? 「反射が一回多いから逆」は誤りです。
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主虹と副虹の色の順序について
1.
主虹と副虹の色の順序について 綾塚 祐二
2.
主虹 副虹
3.
主虹と副虹 • 主虹 – 水滴の中で一回反射した光 –
外側が赤、内側が紫 • 副虹 – 水滴の中で二回反射した光 – 外側が紫、内側が赤
4.
「一回反射が多い『から』色の順序が逆」?
5.
反射が増えても… • 反射の回数によらず、 色の順序は変わりません (赤のほうが浅く曲がる) • では、どこで 順序が変わる???
6.
• そもそも、その主虹の光に 対応する副虹の光は ぜんぜん違う方向に 行っています
7.
曲がる方向が逆 • 水滴の上半分から入った光 による主虹の近くに 見えているのは、 下半分から入った光による 副虹です • つまり逆向きに回った光 が見えています
8.
主虹と副虹(再) • 主虹 – 水滴の上半分から入った光 は下向きに出ていく –
外側が赤、内側が紫 • 副虹 – 水滴の上半分から入った光 は上向きに出ていく – 外側が紫、内側が赤
9.
(水滴の同じ側から入った光の) 出ていく光の向きが逆だから色の順序が逆
10.
屈折率によっては、主虹と同じ色の 順序の副虹も可能です
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