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?

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

Describe the formation of image by a concave lens.

The radii of curvature of he two surfaces of a lens are not the same .It forms image of an object.The surfaces of the lens facing the object and image are interchanged .Will the position of the image change ?

An object is kept 0.2 m from a conex lens of focal length 0.15 m .Find the position of the image.

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.

The image of an object formed by a lens on the screen is not in sharp focus.Suggest a method to get a clear focussing of the image on the screen without distrubing the position of the object,the lens or the screen.