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From the calculations, the absolute refractive index of the material is 0.6.
The refractive index is the ratio of the sine of the angle of incidence to the sine of the angle of refraction.
Having looked at the path of the travelling light wave, we can see that the absolute refractive index of the ray of light is; sine 27/sin 49 = 0.454/0.755
= 0.6
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