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NIOS had a cumulative enrollment of about 15 lakh (1.5 million) students from 2004 to 2009 at secondary and senior secondary levels and enrolls about 3.5 lakh (350k) students annually which makes it the largest open schooling system in the world. NIOS is a governing body just like any other Indian government official department [3]
The HSLC admit card/certificate is actually accepted legally in India as proof of age. Before the passport and PAN or identity card mechanisms the HSLC admit card was the major Photo Identity in circulation.
Light-emitting diodes (LEDs) produce light (or infrared radiation) by the recombination of electrons and electron holes in a semiconductor, a process called "electroluminescence".