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

An unsymmetrical double convex thin lens forms the image of a point object on its axis. Will the position of the image change if the lens is reversed?

Which of the following forms (s) a virtual and erect image fo all positions of the object?

An erect image of 3 tiems the size of the object is obtined with a conccave mirror of radius of curvature 36 cm.What is the position of the object?

The image formed by a concave mirror is observed to be virtual, erect and larger than object,where should be the position of the object?

A lens placed at a distance of 20 cm from an object produces a virtual image 2//3 the size of the object. Find the position of the image, kind of the lens and its focal length.

When the image formed by a concave mirror is at infinity then what is the position of the object?