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Snell’s Law

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Use Snell's law to calculate the angle of emergence (deflection angle) from the angle of incidence in air to the medium.
Angle of incidence (θ1)
degrees  Angle of incidence from the air into the medium
Refractive Index (n1)
    Refractive index specific to the medium
Declination (θ2) degrees  Emission angle in the medium
Snell’s Law: n2*(sinθ2) = n1*(sinθ1); n2 => refractive index of the medium; n1 => refractive index of air (=1)
Formula: θ2 = sin^-1((sinθ1)/n2)

Please also use the formula for calculating the angle of emergence from the medium into air.
http://keisan.site/exec/user/1385798953

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