For what position of an object, a concave mirror forms a real image equal in size to the object ?

Q. (a) For which position of an object, a concave mirror forms a real image equal in size to the object?
(b) State one use of a concave mirror.
(c) An object of height 1 cm is placed at a distance of 15 cm from a concave mirror of radius of curvature 20 cm. Find the position, nature and size of the image formed.

Q. A concave mirror forms a real image of an object placed in front of it at a distance $30cm$, of size three times the size of object. Find (a) the focal length of mirror (b) position of image

Q. The image formed by a concave mirror is real, inverted, and of the same size as that of the object. The position of the object should be