Physical Optics (IFS (Forests Services) Physics (Mains)): Questions 1 - 6 of 6

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Question number: 1

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

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Appeared in Year: 2012

Essay Question▾

Describe in Detail

A step – index silica fiber consists of core of refractive index 1.450 and diameter . 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)

Explanation

  • Here, from question, we can say,
  • The numerical aperture of the optical fiber is given as,

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Question number: 2

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

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Appeared in Year: 2013

Essay Question▾

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

Explanation

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 is passing. Two other narrow slits and are there, which are far t

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Question number: 3

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

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Appeared in Year: 2010

Essay Question▾

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With a suitable diagram, deduce an expression for numerical aperture (NA) for ab optical fiber having refractive indices of core and cladding and , respectively and being placed in a medium of index . (Section – A)

Explanation

Quadrilateral poly1 Quadrilateral poly1: Polygon A, B, C, D Quadrilateral poly2 Quadrilateral poly2: Polygon D, E, F, C Quadrilateral poly3 Quadrilateral poly3: Polygon E, F, G, H Angle α Angle α: Angle between W, Z, I Angle β Angle β: Angle between Z, A_1, C_1 Angle γ Angle γ: Angle between A_

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Question number: 4

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

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Appeared in Year: 2010

Short Answer Question▾

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Between multimode and single mode fibers, explain critically how and why single mode fiber is chosen for communication. (Section – A)

Question number: 5

» Physical Optics » Polarisation and Modern Optics » Single Mode Fibres

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Appeared in Year: 2010

Short Answer Question▾

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Why are the two wavelengths and important in single – mode fiber – optical communication system? (Section – A)

Question number: 6

» Physical Optics » Polarisation and Modern Optics » Ruby and He-Ne Lasers

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Appeared in Year: 2013

Essay Question▾

Describe in Detail

Explain the lasing action of laser using energy level diagram and describe the operation of laser experimental setup. (Section A)

Explanation

  • The light is produced in He – Ne laser by atomic transitions in the Neon atom. The Helium acts as a buffer gas in it. That means Helium doesn’t directly produce laser light, it only helps the atom of the Neon gas to produce lasing in as manner.

  • Helium absorbed some energy, when energy applied to the He – Ne gas mixture, and it achieve an ex

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