Find the distance of object form a concave morror of focal length 10 cm so that image size is four times the size of the object.

Find the distance of object from a concave mirror of focal length 10 cm so that image size is four time the size of the object.

What is the distance of an object from a concave mirror of focal length 20 cm so that the size of the real image is three times the size of the object ?

Find two positions of an object, placed in front of a concave mirror of focal length 15cm, so that the image formed is 3 times the size of the object.

An object is placed in front of a concave mirror of focal length 20 cm. The image formed is three times the size of the object. Calculate two possible distances of the object from the mirror.