Multiple choice

In the design of a single mode step index optical fibre close to upper cut-off, the single-mode operation is not preserved if

  1. radius as well as operating wavelength are halved

  2. radius as well as operating wavelength are doubled

  3. radius is halved and operating wavelength is doubled

  4. radius is doubled and operating wavelength is halved
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

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