本题目来源于试卷: The Wave Nature of Light，类别为 通用国际物理
[问答题]
White light strikes (a) a diffraction grating,hgb,6t x rpsok6jqi 4e9n /1h- and (b) a prismrud0f,4 (7oras gjnrg5 7x/f4 u oyl3m. A rainbow appears on a wall just below the direction of the horizontal incident beam in each case. What is the color of the top of the rainbow in each case? f o0mn4roy4 5,(7 u3grlf/7xarju dsgExplain.
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