WAEC Physics 2023 Paper

Concept:The mirror formula connects the focal length $f$, object distance $u$, and image distance $v$.Explanation:Option A: $N=\frac{360}{\theta}$ is the formula for the number of images formed by two inclined plane mirrors.Option B: $\frac{1}{f}=\frac{1}{u}+\frac{1}{v}$ is the standard mirror formula.Option C: $m=\frac{v}{u}$ gives the linear magnification produced by a mirror.Option D: $f=\frac{1}{D}$ represents the relation between focal length and power of a lens, not a mirror formula.Therefore, $f=\frac{1}{D}$ is not a correct mirror formula.Answer:D. $f=\frac{1}{D}$