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Cambridge IGCSE Physics practice

Paper 3 structured question: Thin lenses

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Thin lenses

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Paper 3Theory (Core)1 marks

Optical devices are used in various applications, including photography and vision correction.

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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Paper 3 structured question: Thin lenses

Paper 3Theory (Core)2 marks

Description

Light Behavior in Lenses

When light rays parallel to the principal axis pass through a convex lens, they converge at the focal point.

  1. a

    Define the term 'principal focus'.

    Aim for approximately 2 distinct marking points.

    [2]