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

Appeared in Year: 2012

Essay Question▾

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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

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Question number: 2

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

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

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Question number: 3

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

Appeared in Year: 2010

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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

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Question number: 4

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

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

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

Appeared in Year: 2013

Essay Question▾

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

Explanation

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