A spherical mirror produces an image of magnification -1, when an object is placed on the principal axis of the mirror at a distance of 40 cm form its pole.
(a) Identify the nature of image.
(b) Identify the nature of spherical mirror.
(c) Find the distance between the object and its image.
(d) How will the nature of the image change, if the object is shifted 10 cm towards the mirror ? Draw a ray diagram to justify your answer.
[Hint. (a) Image is real, inverted/same size as the object, (b) Concave mirror, (c) Zero, (d) Image will be formed beyond C, It will be larger in size.]