$1.$ A fish $0\mathrm{.}75$m below the surface of a pond appears to be at a different depth d$.$ The incident angle between a ray and a normal to the pond$$s surface is $22\mathrm{.}6.$

a$.$ Solve for the refracted angle $2.($ans: $30\mathrm{.}7)$

b$.$ Solve for the depth d the fish appears to be to an observer above the water. $($ans: $0\mathrm{.}525$m deep$)$