A straight line, AB, undergoes two reflections. First reflection occurs in a mirror, placed in the vertical plane at x=0. The reflected line undergoes another reflection, in another mirror, placed in the horizontal plane at y=0. If the x and y intercepts of line AB are p and q respectively before the reflections, then the equation of the line after the second reflection will be:

Question

A straight line, AB, undergoes two reflections. First reflection occurs in a mirror, placed in the vertical plane at  x=0. The reflected line undergoes another reflection, in another mirror, placed in the horizontal plane at y=0. If the x and y intercepts of line AB are p and q respectively before the reflections, then the equation of the line after the second reflection will be: