Sunday, March 11, 2018

homework and exercises - Why would an object appear a different size when in water?


A friend of mine has a homework question and we're having some trouble figuring out what physical mechanisms come into play for this.



An underwater swimmer sees a spherical air bubble that appears to have a diameter $d=$ 1.5 cm. What is its actual diameter?



We are having trouble, specifically, thinking of physical mechanisms that would change the apparent sizes of objects when seen underwater. Is it caused by refraction at the curved surface of the bubble?




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