" e object and image positions."

The height of the object and image are positive if measured………..from the axis.

A convex lens forms a virtual image of an object. What is the position of the object?

a convex lens forms a virtual image of an object. What is the position of the object ?

An object is placed in front of a convex mirror of focal length 30 cm.If the image formed is a quarter of the size of the object,find the position of the image.