Reflect an intersecting line by reflecting one point

Line $l_1$ passes through A=(−1,−2,1), B=(0,1,5). Line $l_2$ has equation $x-1=(y-2)/2=z-3$. They intersect at A. Find:

(i) vector equations of $l_1,l_2$;2 marks

(ii) their acute angle;2 marks

(iii) the position vector of the perpendicular foot F from B onto $l_2$;3 marks

(iv) the equation of the line $l_3$, the mirror image of $l_1$ in $l_2$.3 marks