Correct Answer: Option C

Explanation

\(_an_w = \frac{4}{3} = \frac{\text{speed of light in air}}{\text{speed of light in water}}\)

\(\frac{4}{3} = \frac{3 \times 10^8}{x}\)

x = \(\frac{9 \times 10^4}{4}\)

= 2.25 x 10⁸m/s

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