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1. Explain the self-consistency condition for waveguiding in a dielectric slab waveguide.

2. Discuss the dependence of the number of propagating modes in a dielectric slab waveguide on the ratio of the thickness d of the dielectric slab to the wavelength l0.

3. Considering TE modes in a dielectric slab guide, specify the fundamental mode and discuss the associated cutoff condition.

4. Compare the phenomenon at cutoff in a metallic waveguide with that at cutoff in an optical waveguide.

5. Provide a brief description of an optical fiber.

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