Snell's law|If the angle of incidence is half of the angle of refraction in a medium of refractive i

If the angle of incidence is half of the angle of refraction ,in a medium of refractive index μ, relative to first medium, then the angle of incidence is [NCERT] ,
(1) cos 1/2μ. ,
(2) cos 1/μ,
(3) Sin 1/ 2μ,
(4) sin 1/μ ,
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