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C3 solutions: Refraction

1. A ray of light is incident on a prism of refractive index 1.5 at the angle shown belowCalculate the angle of deviation, D of the emerging ray.Solution2. To identical water waves with frequency of 0.1 Hz travel along the paths shown. One travels through a region of shallow water the other travels the whole way in deep water. If the waves start in phase what will their phase difference be when they meet?

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