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A diver in a swimming pool wants to signal his distress to a person lying...

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A diver in a swimming pool wants to signal his distress to a person lying on the edge of the pool by flashing his water proof flash light 1 He must direct the beam vertically upwards 2 He has to direct the beam horizontally 3 He has to direct the beam at an angle to the vertical which is slightly less than the critical angle of incidence for total internal reflection 4 He has to direct the beam at an angle to the vertical which is slightly more than the critical angle of incidence for the total internal reflection dir 3500 and 7000 then the critical angle of x relative to y will be Tul

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