An underwater diver sees the sun 57 ∘ above horizontal. how high is the sun above the horizon to a fisherman in a boat above the diver?

Angle at which under water diver sees the sun from horizontal =

Angle from normal direction =  90 - 57 =

Refractive index of water = 1.33

Refractive index of water = 1

We have the equation

   1.33 * sin = 1 *sin

  =

This angle is angle from normal, so angle seen by fisherman from horizontal = 90 - 46.42 =

one person pulls 90n one way and the other has 100n pulling the other way.

so the net force = 90 - 100 = -10n,

or the ans can be 10n if the picture shows -90n and 100n instead.

if the person is shown to have +90n, then ans is -10n.

if the person is shown to have -90n, then ans is +10n.