यातायात सिग्नलों में लाल बत्ती का प्रयोग किया जाता है‚ क्योंकि At traffic signal red light is used, because

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यातायात सिग्नलों में लाल बत्ती का प्रयोग किया जाता है‚ क्योंकि At traffic signal red light is used, because

ये खराब दृष्टि वाले लोगों को भी दिखाई दे जाती हैं/It is visible to people having low visibility
ये सुन्दर दिखती हैं/It looks beautiful
उपरोक्त में से कोई नहीं/None of the above
इनकी तरंगदैध्र्य सबसे अधिक है और लम्बी दूरी से देखी जा सकती हैं/It has high wavelength and can travel to a long distance

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