In a single-slit Fraunhofer diffraction experiment, x1 and x2 are the distances of the 1st and 2nd secondary maxima from the center of the diffraction pattern respectively. Assuming the angular spreads are small, the ratio x1 : x2 is:

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?