A convex forms a real image of a poinnt object placed on its principal axis. If the upper half of the lens is painted black

A convex lens form a real image of a point object placed on its principal axis. If the upper half of the lens is painted black, the image will

A convex lens forms a virtual image of an object placed ………… .

A biconvex lens forms a real image of an object placed perpendicular to its principal axis. Suppose the radii of curvature of the lens tend to infinity. Then the image would

A convex lens is used to form an image of an object on a screen. If the upper half of the lens is blackened so that it becomes opaque, then

A lens whose radii of curvature are different is forming the image of an object placed on its axis. If the surfaces of the lens facing the object and image are interchanged will the position of the image change?