Top surface of the glass
A plate of glass with parallel faces having a refractive index of 1.52 is resting on the surface of water in a tank. A ray of light coming from above in air makes an angle of incidence 34.5 with the normal to the top surface of the glass.
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How long does it take the boat to complete a trip consisting of a 283 m displacement down-stream followed by a 257 m displacement up-stream?
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