In the design of a single mode step index optical fiber close to upper cut off, the single mode operation is NOT preserved if
(a) Radius as well as operating wavelength are halved
(b) Radius as well as operating wavelength are doubled
(c) Radius is halved and operating wavelength is doubled
(d) Radius is doubled and operating wavelength is halved
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Query is from Advanced and Tricky Questions topic in portion Advanced and Tricky Questions of Electromagnetic Theory
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