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[Diagram: Light pipe with core and cladding] For a light pipe as shown in the figure: (A) Optical density of core should be greater than the optical density of cladding (B) r and θ\theta will always be equal (C) Optical density of cladding is sinθ\theta.sin i / sin r (D) Optical density of cladding is sin r.sin i / sin θ\theta Choose the correct answer from the options given below:

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