Question

what is the speed of light in a medium of refractive index 1.8

Answer 1

Answer on Question #44804, Physics, Optics

what is the speed of light in a medium of refractive index 1.8

Solution.

The refractive index is defined as

$$n = \frac {c}{v}$$

where $c$ is the speed of light in vacuum and $v$ is the speed of light in the medium

$$v = \frac {c}{n} = \frac {3 \cdot 10 ^ {8} \, \mathrm{m/s}}{1.8} \approx 1.67 \cdot 10 ^ {8} \, \mathrm{m/s}$$

Answer: $1.67 \cdot 10^{8} \, \mathrm{m/s}$

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