The speed of the yellow light in a certain liquid is \( 1.8 \times ...

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The speed of the yellow light in a certain liquid is \( 1.8 \times 10^{8} \mathrm{~m} / \mathrm{s} \). Find the refractive index of the
\( \mathrm{P} \)
liquid.
W
(1) 2.5
(2) 1.5
(3) 1.67
(4) 1.89
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