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The refractive index of water measured b...

The refractive index of water measured by the relation `m = (real depth)/ (apparent depth)` is found to have values of 1.34, 1.38, 1.32 and 1.36, the mean value of refractive index with percentage error is

A

`1.35 +-1.48%`

B

`1.35 +-0%`

C

`1.36 +-6%`

D

`1.36 +-0%`

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