railway RRB Technician Grade 3 Mock Test 2024 General Science Physics

पांढऱ्या प्रकाशाच्या खालीलपैकी कोणत्या रंगाची तरंगलांबी सर्वाधिक असते?

1
हिरवा
2
लाल
3
जांभळा
4
नारिंगी
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