# Define absolute refractive index of a medium.Find its value for glass in which speed of light is 2?10 m/s. PLZ REPLY FAST

Please find below the solution of your asked queries:

**The absolute refractive index of any medium is the refractive index of the medium with respect to vacuum. It is always greater than 1.**

__Definition__-

__Calculation of Absolute refractive index of glass__-For solving this numerical I am assuming that speed of light in glass is 2 * 10

^{8}m/sec as the speed given by you seems to be incorrect.

$\mathrm{n}(\mathrm{absolute}\mathrm{refractive}\mathrm{index})=\frac{\mathrm{c}(\mathrm{speed}\mathrm{of}\mathrm{light}\mathrm{in}\mathrm{vacuum})}{\mathrm{speed}\mathrm{of}\mathrm{light}\mathrm{in}\mathrm{glass}}\phantom{\rule{0ex}{0ex}}\mathrm{n}=\frac{3\times {10}^{8}}{2\times {10}^{8}}\phantom{\rule{0ex}{0ex}}\mathrm{n}=\frac{3}{2}\phantom{\rule{0ex}{0ex}}\mathbf{n}\mathbf{=}\mathbf{1}\mathbf{.}\mathbf{5}$

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