Consider a standard single-mode fiber with a core refractive index n1 = 1.48 and a cladding refractive index n2 = 1.46. Using the V-number condition V ≤ 2.405 where V = (2πaλ)√(n12 - n22), what is the maximum allowable core radius a for the fiber to operate in single-mode at a wavelength λ = 1550 nm?

Which Indian independence movement leader was primarily known for his philosophy and practice of non-violent civil disobedience?

Who gave the call for 'Do or Die' during the Quit India Movement in 1942?

Which of the following revolutionary pairs were imprisoned together in Cellular Jail and faced harsh conditions, contributing significantly to the Indian independence movement?