Which on eamong the following colours has the highest wavelength? निम्नलिखित में से कौन से वर्ण की उच्चतम तरंगदैघ्र्य होती है?

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Which on eamong the following colours has the highest wavelength? निम्नलिखित में से कौन से वर्ण की उच्चतम तरंगदैघ्र्य होती है?