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CAIE IGCSE Physics 3.2.3.2 Terms Focal Length Principal Axis and Questions

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

  • State that a scalar has magnitude only whereas a vector has both magnitude and direction.
  • Classify common quantities such as speed, mass and energy against velocity, force and momentum.
  • Justify a scalar or vector classification using the presence or absence of direction.

CAIE IGCSE Physics 3.2.3.2 Terms Focal Length Principal Axis and Questions question 1

[Maximum number: 2]

Fig. 6.1 shows a thin converging lens used to produce a magnified image of an object AB.

Fig. 6.1

Fig. 6.1

Explain the meaning of the terms principal focus and focal length.
principal focus
focal length

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