Physical Optics (IFS Physics (Mains)): Questions 1 - 2 of 2

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Question number: 1

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

Appeared in Year: 2012

Essay Question▾

Describe in Detail

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) …

Question number: 2

» Physical Optics » Interference » Interference of Light-Young's Experiment

Appeared in Year: 2013

Essay Question▾

Describe in Detail

In a double slit interference experiment, show that the fringe shape is hyerbola. (Section A)


Young’s double slit set up

Young’S Double Slit Set Up

In figure an experimental set of Young’s double slits experiment is shown.

  • In figure the arrangement of the Young’s double slits experiment is shown. S is a narrow slit, from where a monochromatic light of wavelength λ is passing. Two other narrow slits S1… (629 more words) …

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