The boundary between the Fresnel and Fraunhofer zones having a length of 12 units and a wavelength of 3 units is(a) 96(b) 48(c) 192(d) 36The question was asked by my college professor while I was bunking the class.This intriguing question originated from Transverse Magnetic Waves(TM) in division Waveguides of Electromagnetic Theory

The boundary between the Fresnel and Fraunhofer zones having a length

1.	The boundary between the Fresnel and Fraunhofer zones having a length of 12 units and a wavelength of 3 units is(a) 96(b) 48(c) 192(d) 36The question was asked by my college professor while I was bunking the class.This intriguing question originated from Transverse Magnetic Waves(TM) in division Waveguides of Electromagnetic Theory
Answer» RIGHT answer is (a) 96 The explanation: The Fresnel- Fraunhofer boundary is related by the wavelength as R = 2L^2/λ. On SUBSTITUTING for L = 12 and λ = 3, we get R = 2 X 12^2/3 = 96 units.

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