1.

A convex lens makes a real image 4 cm long on a screen. When the lens is shifted to a new position without disturbing the object, we again get a real image on the screen which is 16 cm tall. The length of the object must be [MP PET 1991]

A.            1/4 cm                                    
B.            8 cm
C.            12 cm                                      
D.            20 cm
Answer» C.            12 cm                                      


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