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,

light will travel with different speeds in different mediums. Hence when the light will pass through the upper half of the lens with the refractive index μ1, the image will be formed at O1 and when it will pass through lower half with refractive index μ2, the image will be formed at O2.

Hence, option A and B are correct.