Refractive index of a transparent medium decreases with increase in wavelength of the incident light used.
Refractive index of glass with respect to air is given
μ=Speed of light in air/speed of light in glass =3×10⁸m/s/ 2×10⁸ m/s=1.5
Now,
μ=1/siniC

⇒siniC= 1/μ
iC=sin−1(1/μ)=sin−1(1/1.5)=sin−1(2/3).

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