refractive index of air is 1 , if the critical angle is 30°(glass-air) then refractive index of glass is.....
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The critical angle is the angle of incidence where the angle of refraction is 90∘
The light must travel from an optically more dense medium to an optically less dense medium.
The critical angle s related to the refractive index as
θc=sin−1(n2/n1)
rearranging
n2/n1 = sin(θc)
given θc= 30∘
by substituting the values
n2/n1 =sin(30∘) = o.5
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