Question

Pure water has refractive index 1.33. What is the speed of light through it? ​

Answer 1

Answer:

Since, 

μ = c/v = speed of light in air/speed of light in medium

So, μv=c

or 

$v \: = \frac{c}{μ} = \frac{3 \times 10^{8}m/s}{1.33} = 2.25 \times {10}^{8}m/s$

Therefore the answer is 2.25 × 10^8 m/s

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