Tides describe the regular rising and falling of ocean water. Tides are caused by what?
2 answers:
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We can solve the problem by using Snell's law, which states
where
is the refractive index of the first medium
is the angle of incidence
is the refractive index of the second medium
is the angle of refraction
In our problem,
(refractive index of air), 
and 
(refractive index of carbon disulfide), therefore we can re-arrange the previous equation to calculate the angle of refraction:
From which we find
where
In our problem,
From which we find