Answer :
The light travel faster in fresh water as compare to sea water.
- When light goes from denser to rare medium the speed of light is increases.
- When light travel from rare to denser medium the speed of light is decreases.
- The reflective index of denser medium is more as compare to rare medium.
- The reflective index of sea water is more as compare to fresh water.
Hence, the light travel faster in fresh water as compare to sea water.
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