Question:

A convex lens of focal length 20 cm produces images of the same magnification 2 when an object is kept at two distances x₁ and x₂ (x₁ > x₂) from the lens. The ratio of x₁ and x₂ is?

4:3

5:3

2:1

3:1

Correct option is D. 3:1
Magnification is 2
If image is real, x₁ = 3f/2
If image is virtual, x₂ = f/2
x₁/x₂ = 3:1