3(i)
(a) Is it possible for a concave lens to form an image of size two times that of the object? Write Yes or No.
(b) What will happen to the focal length of the lens if a part of the lens is covered with an opaque paper?
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(a) No.
(b) The focal length of the lens will not change.
Reason — The focal length of a lens is a characteristic property of the lens itself and is determined by its shape and refractive index. Covering a portion of the lens with opaque paper will not alter the lens's inherent optical properties.