What is the purpose of cladding, prevents signal degradation , prevents physical damage to fibres, When the angle of incidence is greater than the critical angle, Pattern formed is less intense with wider maxima , Contains equally spaced slits very close together, Red light , Which light diffracts the most , Blue light, Violet , Red light , Orange , Yellow, Longer wavelength leads to , less diffraction, increased frequency, reduced frequency, greater diffraction, Higher refractive index means , more optically dense , less optically dense, faster travel , slower travel , What causes pulse broadening , modal dispersion , diffraction , refraction, reflection, material dispersion, Effect of a white light source, wider maxima , narrow maxima , more intense , less intense , Purpose of an outer sheath , prevent physical damage to fibres , prevents loss of information, more energy, more diffraction, How to prevent modal dispersion , monochromatic light, white light , narrow core , wider core , Ways to prevent material dispersion, monochromatic light, white light , narrow core, wider core, Second harmonic has how many nodes, 1, 2, 3, 4.

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