Reflect a light ray using the plane normal

A=(4,1,0), and line l1 is $x-3=-y=(z-3)/2$.

(i) Find plane π containing A and perpendicular to l1, in scalar-product form.3 marks

(ii) Find P on l1 with AP perpendicular to l1.3 marks

A ray travels along l2 from (0,−9,1) to P and reflects in π along l3, in the same plane as l1,l2, with equal angles between l1,l2 and l1,l3. Find l3.6 marks