A converging lens is used to form an image on a screen. When the upper half of the lens is covered by an opaque screen

A converging lens is udes to form an image on a screen. When the upper half of the lens is covered by an opaque screen,

A convergeing lens is used to form an image on a screen.When the upper half of the lens is converd by an opaque screen,

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 convex lens is used to form image of an object on screen. When half of the lens is covered by painting black on it, then

Name the lens used to obtain the image on a screen.

A concave mirror forms the image of an object on a screen. If the lower half of the mirror is covered with an opaque card, the effect would be