A) नीला
B) बैंगनी
C) लाल
D) हरा
चूंकि, लाल रंग का फ्रीक्वेंसी सबसे कम होता है। इसलिए, दिए गए रंगों में से लाल रंग का चौड़ाई सबसे लंबी होता है।
जैसे, $\nu=v \lambda$
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