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A light ray of wavelength 589 nm is incident at an angleθ on the top surface of a block of polystyrene surrounded byair.

a) Find the maximum value of θ for which the refracted raywill undergo total internal reflection at the left vertical face of the block.
b)Find the maximum value of θ for which the refracted ray will undergo total internal reflection at the left vertical face of the block for the case in which the polystyrene block is immersed in water.

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