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The refractive index of second medium with respect to the first medium $$n_{21}$$ is given by which formula?
The sum of the speed of light in the first medium and the speed of light in the second medium $$v_1 + v_2$$
The product of the speed of light in first medium and the speed of light in the second medium. $$v_1 \times v_2$$
Ratio of speed of light in first medium to speed of light in second medium. $$v_1 / v_2$$
Ratio of speed of light in second medium to speed of light in first medium. $$v_2 / v_1$$
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