How many modes are present in a slab waveguide when it's 3π < V < 4π?

How many modes are currently in used for propagating light along an optical channels?a.Five modesb.One modec.Two modesd.Three modes

Compare parallel plane waveguide and rectangular waveguide.Explain the different mode numbers which can exist in parallel plawaveguide and rectangular waveguide.Define the Dominant mode and Evanescent mode in waveguide

why tem mode is impossible in rectangular waveguide

What is the wavelength of the wave whose spatial profile is shown below?  Express your answer in nm

Can we use antennas to make different mode connections in waveguide?State and explain the different feed connections and comment on existingmode numbers.