Please answer this q.
Q.10. The refractive index of water is 1.33 and the speed of light in air is 3 × 10 8   m s - 1 . Calculate the speed of light in water.
 

Dear student,refractive index=speed of light in vacuumspeed of light in water1.33=3×108speed of light in waterspeed of light in water=3×1081.33speed of light in water==2.25×108 m/sRegards

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refer this link
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2.3?10^8 m/s
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