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A wave with speed 7.0 cm/s in deep water moves towards shallow water, and is incident on the boundary at an angle of 250. If

A wave with speed 7.0 cm/s in deep water moves towards shallow water, and is incident on the boundary at an angle of 250. If the speed of the wave in shallow water is 4.0 cm/s, what is the angle of refraction? [2 marks]

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