Physical Optics-Polarisation and Modern Optics (IFS Physics (Mains)): Questions 1 - 1 of 1

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Question number: 1

» Physical Optics » Polarisation and Modern Optics » Principles of Fibre Optics Attenuation

Appeared in Year: 2012

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A step – index silica fiber consists of core of refractive index 1.450 and diameter 90μm . If the numerical aperture of the fiber is 0.16, calculate:

(i) the acceptance angle of the fiber,

(ii) refractive index of the cladding, and

(iii) if the fiber is immersed in water of refractive index 1.33, how does the acceptance angle change? (paper -1) (Section – A)


  • Here, from question, we can say,




  • The numerical aperture of the optical fiber is given as,

NA=η… (334 more words) …

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