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For LED's to emit light in visible region of electromagnetic light , it should have energy band gap in the range of :

(a) 0.1 eV to 0.4 eV \[\](b) 0.5 eV to 0.8 eV\[\](c) 0.9 eV to 1.6 eV\[\](d) 1.7 eV to 3.0 eV
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