The position of the image formed by the combination of lenses is:

Question

G1 Physics · Accepted Answer

Image For lens 1: f₁ = +10 cm u₁ = -30 cm Using: 1/f = 1/v - 1/u v₁ = 15 cm The second lens is 5 cm to the right of the first lens. Hence object distance for lens 2: u₂ = +10 cm For lens 2: f₂ = -10 cm Using lens formula: v₂ = ∞ Therefore, rays emerging from lens 2 are parallel. For lens 3: f₃ = +30 cm Parallel rays form the image at its focus. Hence the final image is formed 30 cm to the right of the third lens.