What is the RI value of water?
GeneralClass 12AllAnswered 27 Mar 2026
Answer
The standard RI value of water is 1.333 (or approximately 1.33) at room temperature (20°C) for the sodium D-line wavelength. In practical applications, 1.33 is commonly used for calculations. This relatively low refractive index makes water useful for many optical applications and explains common phenomena like why pools look shallower than they actually are.
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