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

(a) 
will be shifted downward 
(b) 
will be shifted upward 
(c) 
(d) 

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

(a) 
will be shifted downward 
(b) 
will be shifted upward 
(c) 
(d) 
