nā = 1.196. A light beam strikes the boundary between two mediums with different indices of refraction.
When light waves cross the border between two materials with different densities, like air and glass, their speed changes. They alter direction as a result, which is a phenomenon known as refraction. Refraction is the shift in a wave's direction when it travels through one medium and then another.
Absolute refractive index is the comparison between the speed of light in vacuum and the light speed in another medium. Relative refractive index is the ratio of one medium's light speed to a different medium's light speed.
Snell's law = nāsinĪøā= nāsinĪøā
and the velocity of light, N = C/ Vn
nā = 1.2
nā = 1.196
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