Water is optically _________ than air.

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Solution

Denser mediums are those in which the speed of light is less than when it travels in a rarer medium.
Water is optically denser as the speed of light is less in water than in air.
Speed of light in water is $2.25 \times 10^{8} m s^{- 1}$ and speed of light in air is $3 \times 10^{8} m s^{- 1}$ .
Hence, water is optically denser than air.

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