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6. Give the conditions for total internal reflection to occur. (4) 7. Light travels from water to air with an incident angle of 25%. (7air-water=

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6. Give the conditions for "total internal reflection" to occur. (4) 7. Light travels from water to air with an incident angle of 25%. (7air-water= 1.3) (fair= 1.) (17 water= 1.3) a) Make a sketch to represent the situation. (2) b)Calculate the angle of refraction. (2) c) Calculate the critical angle. (2)

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