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In the design of a single mode step index optical fiber close to upper cut-off, the single mode operations is NOT preserved if | |
A. | radius as well as operating wavelength are halved [Wrong Answer] |
B. | radius as well as operating wavelength are doubled [Correct Answer] |
C. | radius is halved and operating wavelength is doubled [Wrong Answer] |
D. | radius is doubled and operating wavelength is halved [Wrong Answer] |