In Fraunhofer diffraction due to a single slit, if the first minima is obtained at a diffraction angle θ, then the path difference between the light rays originating from the top edge and the bottom edge of the slit is equal to:

Which of the following events is considered a major turning point that fueled Indian nationalism during British rule due to its brutal nature and widespread condemnation?

Which of the following events is considered the first major peasant uprising against the British in India?