WAEC Physics 2019 Paper

Concept:The diagram shows an optical bench set-up to verify the lens formula using a lens and a screen.Explanation:The set-up uses an object, a converging lens, and a screen.The object distance $u$ and image distance $v$ are measured.A sharp image is formed on the screen by adjusting the position of the lens.These measured values are then used to verify the lens formula:$$\frac{1}{f} = \frac{1}{u} + \frac{1}{v}$$Therefore, this arrangement is used to verify the lens formula.Answer:A. lens formula