Physics 5054 · O Level · Thin lenses

Thin lenses — practice question

The diagram shows a convex lens producing an image I of an object O. It is not drawn to scale. What is the focal length of the lens?

  • A$16\,\text{cm}$
  • B$20\,\text{cm}$
  • C$36\,\text{cm}$
  • D$45\,\text{cm}$

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