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I will paste the question below and add my understanding so far and where I think I'm confused

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Screen Shot 2019-08-04 at 9.51.52 PM.png

Screen Shot 2019-08-04 at 9.51.38 PM.png

G. 7. a)
Here's a piece of the surface
2 = 4 - ( ) + (3 ) :
Clear [f, x, y, z, r, t, surfaceplotter];
f [x_, y_] = 4 - (x/2)^2 + (y/2)^2;
x[r_, t_] = r Cos[t];
y[r_, t_] = r Sin[t];
z[r_, t_] = f[x[r, t], y[r, t]];
surfaceplotter[r_, t_] = {x[r, t], y[r, t], z [r, t]};
surface = ParametricPlot30 [surfaceplotter[r, t], {r, 0, 2), {t, 0, 2 Pil, ViewPoint -> CMView, PlotRange -> All,
Boxed -> False, AxesLabel -> {"x", "y", "z"}]
2
5.0
24.0 1
3.5-
3.0
A light beam emanates from {-1, 1, 6} and strikes the surface at:
hit = surfaceplotter [1, 1.2]
[0 . 362358, 0.932039, 4.18435}

Screen Shot 2019-08-04 at 9.51.52 PM.png

Here's a look:
lightsource = {-1, 1, 6};
Show [ surface, Vector [hit - lightsource, Tail -> lightsource, VectorColor -> Red], PlotRange -> All]
X
5
4
3
- 2
Your job is to plot the vector on which the reflected light moves.

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