$33\mathrm{.}17$ The critical angle for total internal reflection at a liquid$$air interface is $($a$)$ If a ray of light traveling in the liquid has an angle of incidence at the interface of what angle does the refracted ray in the air make with the normal? $($b$)$ If a ray of light traveling in air has an angle of incidence at the interface of what angle does the refracted ray in the liquid make with the normal?