If a fiber operates at 1400nm with the diameter of about 10 μm, n1 = 1.30, Δ = 0.80% , V = 3.5, then how many modes will it have?

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If a fiber operates at 1400nm with the diameter of about 10 μm, n<sub>1</sub> = 1.30, Δ = 0.80% , V = 3.5, then how many modes will it have?