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CAIE IGCSE Physics: Lens Axis, Focus & Focal Length Question Bank

Practise naming key lens features so ray diagrams use focal length, principal axis and principal focus consistently and accurately.

Syllabus
2026–2028
Course
Physics 0625

Exam points

  • label focal length, principal axis and principal focus on a converging lens diagram
  • use the focal point to choose the correct path for a ray parallel to the principal axis

3.2.3.2—Terms focal length, principal axis and question 1

[Maximum number: 1]

Fig. 6.1 is a full-size diagram of a lens and an image I of an object.

Fig. 6.1

Fig. 6.1

The focal length of the lens is 3.0 cm .

On Fig. 6.1, mark two points with labels F , to show the positions of the principal focuses (focal points) of the lens.

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