A) निळा
B) जांभळा
C) लाल
D) हिरवा
लाल रंगाची वारंवारता सर्वात कमी असल्याने, दिलेल्या रंगांपैकी लाल रंगाची तरंगलांबी सर्वात जास्त असते.
कारण, $\nu=v \lambda$
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