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Learning objective

Define and apply the concepts of focal length, principal axis, and principal focus (focal point).

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  • Practise with linked questions.
Cambridge IGCSE PhysicsSubject contentCore content

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Quick explanation

Define and apply the concepts of focal length, principal axis, and principal focus (focal point)

  • This point belongs to Thin lenses, especially Thin lenses outcomes.
  • You need to be able to define and apply the concepts of focal length, principal axis, and principal focus (focal point).
  • The key ideas to know are Define and Use.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

DefineUse

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This objective helps connect Thin lenses outcomes to exam-style questions, flashcards, and revision notes for Thin lenses.

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Paper 3 structured question: Thin lenses

Paper 3Theory (Core)1 marks

Description

Optical Device Characteristics

A convex lens has a focal length of 10 cm. Light rays parallel to the principal axis pass through the lens.

  1. a

    State the focal length of the lens.

    Aim for approximately 1 distinct marking point.

    [1]
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