The numerical aperture of a material with acceptance angle of 60 degree in water will be(a) 1.15(b) 2.15(c) 5.21(d) 1.52This question was posed to me by my college director while I was bunking the class.My doubt stems from Refractive Index and Numerical Aperture topic in division EM Wave Propagation of Electromagnetic Theory

The numerical aperture of a material with acceptance angle of 60 degre

1.	The numerical aperture of a material with acceptance angle of 60 degree in water will be(a) 1.15(b) 2.15(c) 5.21(d) 1.52This question was posed to me by my college director while I was bunking the class.My doubt stems from Refractive Index and Numerical Aperture topic in division EM Wave Propagation of Electromagnetic Theory
Answer» The correct answer is (a) 1.15 The explanation is: The numerical aperture is given by NA = n sin θa, where n is the refractive INDEX. It is 1.33 for WATER medium. Given that the acceptance ANGLE is 60, we GET NA = 1.33 sin 60 = 1.15.

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