A) નીલો
B) સારસારો
C) લાલ
D) પીળો
કારણ કે, લાલ રંગનો સૌથી ઓછો આવૃત્તિ હોય છે. તેથી, આપેલ રંગોમાં લાલ રંગનો સૌથી લાંબો તરંગ હોય છે.
જેમ કે, $\nu=v \lambda$
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