An inverted image of an object is viewed on a screen from the side facing a converging lens. An opaque card is then introduced covering only the upper half of the lens. What happens to the image on the screen?
(a) Half the image would disappear.
(b) The entire image would appear and remain unchanged.
(c) Half the image would disappear and be dimmer.
(d) The entire image would appear, but would be dimmer.