In a converging lens of focal length f and the distance between real object and its real image is 4f. If the object moves x₁ distance towards lens its image moves x₂ distance away from the lens and when object moves y₁ distance away from the lens its image moves y₂ distance towards the lens, then choose the correct option :-

Question

G1 Physics · Accepted Answer

Derived solution: Step 1: Use the thin-lens formula 1/f = 1/v - 1/u with m = v/u. For lens material/medium changes use the lens-maker relation with the relative refractive index; powers of thin lenses in contact add. Step 2: Substitute the values given in the question and apply the geometry/sign convention shown. Step 3: On simplification the result is x₁ < x₂ and y₁ > y₂. Therefore the correct option is C.