1) What is the purpose of cladding a) prevents signal degradation b) prevents physical damage to fibres c) When the angle of incidence is greater than the critical angle d) Pattern formed is less intense with wider maxima e) Contains equally spaced slits very close together f) Red light 2) Which light diffracts the most a) Blue light b) Violet c) Red light  d) Orange e) Yellow 3) Longer wavelength leads to a) less diffraction b) increased frequency c) reduced frequency d) greater diffraction 4) Higher refractive index means a) more optically dense b) less optically dense c) faster travel d) slower travel 5) What causes pulse broadening a) modal dispersion b) diffraction c) refraction d) reflection e) material dispersion 6) Effect of a white light source a) wider maxima b) narrow maxima c) more intense d) less intense 7) Purpose of an outer sheath a) prevent physical damage to fibres b) prevents loss of information c) more energy d) more diffraction 8) How to prevent modal dispersion a) monochromatic light b) white light c) narrow core d) wider core 9) Ways to prevent material dispersion a) monochromatic light b) white light c) narrow core d) wider core 10) Second harmonic has how many nodes a) 1 b) 2 c) 3 d) 4

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