The speed of light in water is $2.25 \times 10^8 m / s$. If the speed of light in vacuum be $3 \times 10^8 m / s$, calculate the refractive index of water.
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solution Speed of light in vacuum $=3.0 \times 10^8 m / s$
Speed of light in water $=2.25 \times 10^8 m / s$
Refractive index of water $=$ ?
We know that
Refractive index of water $=\frac{\text { Speed of light in vacuum }}{\text { Speed of light in water }}$
Refractive index of water $=\frac{3 \times 10^8}{2.25 \times 10^8}=1.33$
Speed of light in water $=2.25 \times 10^8 m / s$
Refractive index of water $=$ ?
We know that
Refractive index of water $=\frac{\text { Speed of light in vacuum }}{\text { Speed of light in water }}$
Refractive index of water $=\frac{3 \times 10^8}{2.25 \times 10^8}=1.33$
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