We describe how to modify an existing speed-of-light apparatus to measure the speed of light in water. We derive the necessary formulas to account for refraction and light’s passage through both water and air. We obtain for the speed of light in air and for the speed of the light in water. Both results are within 7% of established values.
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APPARATUS AND DEMONSTRATION NOTES| June 01 2010
Measurements of the speed of light in water using Foucault’s technique
Jed Brody, Laura Griffin, Phil Segre; Measurements of the speed of light in water using Foucault’s technique. Am. J. Phys. 1 June 2010; 78 (6): 650–653. https://doi.org/10.1119/1.3373942
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