Complete the ray diagram given alongside. Also mention any two natures of the image thus formed. If the power of the lens is +4D, What should be the distance between lens and magazine to read it properly?

Ray diagram is drawn as follows:-

Ray diagram of an object placed between F and 2F of a convex lens.

Natures of this image formed are as follows:-
(i)   It is real.
(ii)  It is inverted.
(iii) It is magnified.
                 (All these natures of the image can be noticed from the figure drawn above.)

The lens has power of +4D which means the lens is convex and it is used as remedy for long sightedness i.e. hypermetropia. 
Power of the lens, P = +4D
Focal length of the lens, f = 1/P 
                                         = 1/4 
                                         = 0.25 m 
                                         =25 cm

The distance between the lens and magazine should be at least 25 cm to be read properly.