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A convex lens forms a real image of a point object placed on its principal axis. If the upper half of the lens is painted black,
If the upper half of the convex lens is painted, then only the intensity of the image will decrease because the amount of light passing through the lens will decrease. Also, there will be no shift in the position of the image since all the other parameters like distance between the lens and the object, focal length etc. remains the same.
Hence, option C and D are correct.
Consider three converging lenses L1, L2 and L3 having identical geometrical construction. The index of refraction of L1 and L2 are μ1 and μ2 respectively. The upper half of the lens L3 has a refractive index μ2 (figure 18-Q3). A point object O is imaged at O1 by the lens L1 and at O2 by the lens L2 placed in same position. If L3 is placed at the same place,