# If the speed of light in vacuum is 3 × 10^8 ms^−1, find the speed of light in a medium of absolute refractive index 1.5. - Science

If the speed of light in vacuum is 3 × 108 ms−1, find the speed of light in a medium of absolute refractive index 1.5.

#### Solution

Given:-

Speed of light in vacuum = 3 × 108 ms−1

Refractive index of the medium:

n_m="Speed of light in vacuum"/"Speed of light in medium"

rArr1.5=(3xx10^8)/v

rArrv=(3xx10^8)/1.5=2xx10^8" m/s"

Hence, the speed of light in the medium of refractive index 1.5 is 2 × 108 m/s.

Concept: Refraction of Light Through a Rectangular Glass Slab
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