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  4. If the speed of light in vacuum is C m / sec, then the velocity of light in a medium of refractive index 1.5 is

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Q. If the speed of light in vacuum is $C\, m / sec$, then the velocity of light in a medium of refractive index $1.5$ is

Ray Optics and Optical Instruments

Solution:

$\mu=\frac{C}{C_{m}} \Rightarrow C_{m}=\frac{C}{1.5}$