Physical Optics [IFS (Forests Services) Physics (Mains)]: Questions 1 - 5 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,

• where, is acceptance angle of the fiber. is the refracting medium of surrounding of optical fibe

… (324 more words) …

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

• 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 to each other of distance .

• Light waves, which come out from slit S, fall on both and , and f

… (589 more words) …

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

… (917 more words) …

Question number: 4

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

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Appeared in Year: 2010

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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