A water droplet is optically ________ than air around it.

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Solution

The speed of light in air is more than the speed of light in water, so water is optically denser than air.
Between air and water, air is rarer and water is a denser medium.
The Refractive Index of air is 1.0003 and water is 1.33.
Hence, a water droplet is optically denser than air around it.

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