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Q.

If the speed of light in vacuum is $3 \times 10^{8} m / s$ , the absolute refractive index of another medium in which light travels with a speed of $1.4 \times 10^{8} m / s$ is ____.

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Detailed Solution

If the speed of light in vacuum is

3 \times 10^{8} m / s

, the absolute refractive index of another medium in which light travels with a speed of

1.4 \times 10^{8} m / s

is

2.14 .

It has been given that,
Speed of light in vacuum,

c = 3 \times 10^{8} m / s

Speed of light in medium,

v = 1.4 \times 10^{8}

m / s

Absolute refractive index =

\frac{Speed of light in vacuum}{Speed of light in medium}

= \frac{3 \times 10^{8}}{1.4 \times 10^{8}}

= 2.14

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If the speed of light in vacuum is 3×108 m/s, the absolute refractive index of another medium in which light travels with a speed of 1.4×108 m/s is ____.