The graph showing correctly the variation of image distance `(v)` as a function of object distance `(u)` in case of a concave mirror is

The graph in shows the variation of image distance (v) with object distance (u) in case of a lens. Find focal length of the lens. What is the nature of the lens, if image formed is real ? .

What is the ratio of object distance to image distance in case of a concave mirror when its magnification is 0.5?

What is the minimum distance between an object and its real image in the case of a concave mirror ?

The graph between the image distance (v ) and object distance (u) from the convex lens is

What is the minimum distance between an object and its image in case of concave mirror?

Where is the image formed when an object is at large distance from a concave mirror?