The absolute refractive index (n) of a medium with respect to air is 2. The speed of light (v) in that medium is _____ x $10^{8}$ m/s. (Take the speed of light (c) in air as 3 x $10^{8}$ m/s.)
1.5

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Solution

The correct option is A 1.5
Refractive index (n) is the ratio of the speed of light in air (c) and the speed of light in vacuum (v).
n = $\frac{c}{v}$
2 = (3 x $10^{8}$ )/v
v = 1.5 x $10^{8}$ m/s

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The absolute refractive index of a medium with respect to air is given by :

[c = speed of light in air, v = speed of light in the medium]

1.5 \times 10^{8}

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