General Science Physics Optics

Which of the following represents the critical angle of a medium(θc), for light going from the medium to the air? (Given μ2 = 1 and μ1 = μ) 

1
θc = sin (1/μ)
2
θc = cos-1 (1/μ)
3
θc = sin-1 μ
4
θc = sin-1 (1/μ)

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