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See refraction is a phenomenon which occurs only for Electromagnetic Waves (Light). Whereas Ultrasonic waves are sound waves. And sound waves do not exhibit refraction. Reason for this lies in "How these two kinds of waves propagates"
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For ultrasonic wave the  ratio of velocity  in water and air is nearly same of the refarctive index of air to water medium. So, there is no bending occurs. 

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