Describe how the nature, size and position of the image formed by a concave mirror change as an object is gradually brought from a very large distance toward the pole along the principal axis. For each position listed below, draw a neat, labelled ray diagram and clearly state:
• Position of the image (with respect to P, F and C)
• Nature of the image (real/virtual, erect/inverted)
• Relative size of the image (diminished/same size/enlarged)
(i) Object at infinity
(ii) Object beyond C
(iii) Object at C
(iv) Object between C and F
(v) Object at F
(vi) Object between F and P