Concave mirror forms real image of distant object, the sun, at its principal focus, which is in front of the mirror. Focal length is the distance between pole of the mirror and the focus, focal length= 24 cm.

(I) Actually, meet or intersect with each other. (II) Actually, converge at a point. (III) Appear to meet when they are produced in the backward direction. (IV) Appear to diverge from a point.