A convex lens of focal length 40 cm forms an image of an extended source of light on a photoelectric cell. A current I is produced. The lens is replaced by another convex lens having the same diameter but focal length 20 cm. The photoelectric current now is : [Jan. 27, 2024 (I)]
(a) 2I
(b) 4I
(c) 2I
(d) I