Question

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 and the lower half has μ₂ (figure 18-Q4). A point object O is imaged at O₁, by the lens L_2, and at O₂ by the lens L₂ placed in same position. If L₃ i s placed at the same place,

(a) there will be an image at O₁,
(b) there will be an image at O₂.
(c) the only image will form somewhere between O₁ and O₂,
(d) the only image will form away from O₂.

Answer 1

(a) there will be an image at O₁

(b) there will be an image at O₂.