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Ascuba diver uses his waterproof flashlight to shine a beam of light so that it strikes the surface of the water at an angle of incidence θi. use snell's law to find the angle of incidence that would give an angle of refraction for the refracted ray to be directed right along the surface, and show that θi is the same as the critical angle for total internal reflection.
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Ascuba diver uses his waterproof flashlight to shine a beam of light so that it strikes the surface...
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