railway RRB Technician Grade 1 Mock Test 2024 Electronic Mechanic Electronic Devices and Circuits LED Lights

निम्नलिखित में से कौन-सा LED अदृश्य प्रकाश उत्सर्जित करता है?

1
लेज़र LED 
2
दुरंगा LED 
3
अवरक्त LED 
4
तिरंगा LED 
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