A fish is $2\mathrm{.}1$ m beneath the surface of a still pond of water. At what maximum angle can the fish look toward the

surface $($measured with respect to the normal to the surface$)$ in order to see a fisherman sitting on a distant bank? $($for

water, n $=1\mathrm{.}333)$

a $18\mathrm{.}6$

b $37\mathrm{.}2$

c $48\mathrm{.}6$

d The fish will not see the fisherman at any angle.