Explanation:

Constitutional provisions:

• Part 17 of the constitution of India (Articles 343 to Article 351) makes elaborate provisions dealing with the official language of the Republic of India.
• The main provisions dealing with the official language of the Union are embodied in Articles 343 and 344 of the Constitution of India. The Official languages have been listed in the 8th schedule of Constitution of India.
• The constitution made it clear that President may, during the said period, by order authorize the use of the Hindi language in addition to the English language and of the Devanagari form of numerals in addition to the international form of Indian numerals for any of the official purposes of the Union.
• The constitution also makes it clear that even after 15 years, the Parliament by law may provide for the continued use of English for any specific purpose.
• The constitution has put all authority in the hands of the central government both for formulating and implementing the language policy.For this the Department of Official Language was set up in June 1975 as an independent Department of the Ministry of Home Affairs. 
• It is also special responsibility of the centre to develop and spread the official language (Hindi) of the union (art. 351).