4.33 x 108ms-1
4.00 x 108ms-1
2.25 x 108ms-1
1.33 x 108ms-1
Correct answer is C
\(_an_w = \frac{4}{3} = \frac{\text{speed of light in air}}{\text{speed of light in water}}\)
\(\frac{4}{3} = \frac{3 \times 10^8}{x}\)
x = \(\frac{9 \times 10^4}{4}\)
= 2.25 x 108m/s
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