यदि कोई प्रकाश किरण किसी गोलीय दर्पण पर टकराती है, तो परावर्तन कोण को आपतन बिंदु पर किस संदर्भ रेखा से मापा जाता है?

Which movement aimed to promote Khadi, a hand-spun and handwoven cloth native to India?

Who were prominent leaders associated with the initial phase of the Telangana Rebellion (1946-1951) against the Nizam's rule and feudal landlords?

What was the immediate trigger for the Revolt of 1857?